Multifunctional exercise sled with oblate spheroid wheel and dynamic inertial resistance

Abstract

An apparatus for a multifunctional exercise sled with an oblate spheroid wheel and dynamic inertial resistance are disclosed. The apparatus may include a hollow wheel having an internal volume. The hollow wheel may house a particulate material in the internal volume. The apparatus may also include an axle passing through the center of the hollow wheel. The apparatus may further include a frame coupled to the axle. The apparatus may also include a handle coupled to an end of the frame opposite the axle. The apparatus may further include a skid coupled to the frame to support the handle.

Description

PRIORITY

[0001] This application claims priority to U.S. Provisional Patent Application No. 63 / 781,722, filed Apr. 1, 2025, the contents of which are hereby incorporated in their entirety.TECHNICAL FIELD

[0002] The present disclosure relates to the field of weight training and physical conditioning. More specifically, the present disclosure relates to a multifunctional exercise sled with an oblate spheroid wheel and dynamic inertial resistance.BACKGROUND

[0003] The field of strength training and physical conditioning utilizes a variety of equipment such as sleds, wheelbarrows, ab-rollers, kettlebells, and pulling systems to target muscular power, endurance, and stability. For example, an exercise sled is a piece of fitness equipment used for strength and conditioning workouts. It typically consists of a flat platform or base, often made of metal or plastic, with a harness or straps attached for pulling or pushing. Some sleds have handles for pushing. Some sleds have one or more wheels. A user may load the sled with weights and push or pull the sled during a workout. While this equipment supports specific exercise modalities—pushing, pulling, carrying, rolling, and dragging—users often require multiple devices to achieve comprehensive workouts. Existing solutions may lack versatility, offer only static resistance, or produce excessive noise and surface wear, limiting their effectiveness in modern training environments.

[0004] Traditional fitness equipment often relies on friction-based resistance, static loads, or fixed-weight designs, which can result in inconsistent performance, increased noise, and potential damage to flooring surfaces. The use of multiple separate devices for different exercise modalities can also contribute to facility clutter and inefficient workout transitions, presenting challenges for both commercial and home fitness environments.SUMMARY OF THE INVENTION

[0005] Aspects provide systems and methods for a multifunctional exercise sled with an oblate spheroid wheel and dynamic inertial resistance. Examples of the present disclosure may include an apparatus. The apparatus may include a hollow wheel having an internal volume. The hollow wheel may house a particulate material in the internal volume. The apparatus may also include an axle passing through the center of the hollow wheel. The apparatus may further include a frame coupled to the axle. The apparatus may also include a handle coupled to an end of the frame opposite the axle. The apparatus may further include a skid coupled to the frame to support the handle.

[0006] In combination with any of the above examples, the hollow wheel may have an oblate spheroid shape.

[0007] In combination with any of the above examples, the apparatus may include a fill port in the hollow wheel to allow the particulate material to be added to or removed from the internal volume.

[0008] In combination with any of the above examples, the fill port may include a threaded cap. The fill port may also include a seal to prevent leakage of the particulate material from the internal volume.

[0009] In combination with any of the above examples, the apparatus may include an anchor ring coupled to the frame.

[0010] In combination with any of the above examples, the axle may extend beyond a width of the hollow wheel to receive and secure weight plates.

[0011] In combination with any of the above examples, the hollow wheel may include a raised tread pattern on an external surface of the hollow wheel.

[0012] In combination with any of the above examples, the hollow wheel may include an internal rib to reinforce a wall of the hollow wheel.

[0013] In combination with any of the above examples, the handle may be removably coupled to the frame via a quick-release pin.

[0014] In combination with any of the above examples, the skid may be rotatable relative to the frame to enable vertical storage of the apparatus.

[0015] In combination with any of the above examples, the handle may be lockable in an upright position to enable vertical storage of the apparatus.

[0016] Alone or in combination with any of the above examples, examples of the present disclosure may include an apparatus. The apparatus may include a hollow wheel having an internal volume. The hollow wheel may house a particulate material in the internal volume. The apparatus may also include an axle passing through the center of the hollow wheel. The axle may extend beyond a width of the hollow wheel to form a first hand grip on a first side of the hollow wheel and a second hand grip on a second side of the hollow wheel.

[0017] In combination with any of the above examples, the hollow wheel may have an oblate spheroid shape.

[0018] In combination with any of the above examples, the apparatus may include a fill port in the hollow wheel to allow the particulate material to be added to or removed from the internal volume. The fill port may include a threaded cap. The fill port may also include a seal to prevent leakage of the particulate material from the internal volume.

[0019] In combination with any of the above examples, portions of the axle extending beyond the width of the hollow wheel may receive and secure weight plates.

[0020] In combination with any of the above examples, the hollow wheel may include a raised tread pattern on an external surface of the hollow wheel.

[0021] In combination with any of the above examples, the hollow wheel may include an internal rib to reinforce a wall of the hollow wheel.

[0022] Alone or in combination with any of the above examples, examples of the present disclosure may include a method of exercising. The method may include performing an exercise using a rolling fitness apparatus. The rolling fitness apparatus may include a hollow wheel defining an interior volume. The rolling fitness apparatus may also include a particulate material disposed within the interior volume. The exercise may include rolling the hollow wheel along a surface. The particulate material may shift within the interior volume during the exercise to provide dynamic inertial resistance.

[0023] In combination with any of the above examples, the method may further include adjusting an exercise load of the rolling fitness apparatus. Adjusting the exercise load of the rolling fitness apparatus may include at least one of adding the particulate material through a fill port in the hollow wheel, removing the particulate material through the fill port, mounting at least one weight plate on a portion of an axle passing through a center of the hollow wheel and extending beyond a width of the hollow wheel, or removing at least one weight plate on the portion of the axle passing through the center of the hollow wheel and extending beyond the width of the hollow wheel.

[0024] In combination with any of the above examples, the exercise may include at least one of pushing a sled including the hollow wheel along the surface, carrying the sled in a wheelbarrow configuration, moving the sled using a rope coupled to an anchor ring, or performing an abdominal rollout by grasping one or more axle portions extending beyond a width of the hollow wheel.BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The figures illustrate examples of systems and methods for a multifunctional exercise sled with an oblate spheroid wheel and dynamic inertial resistance.

[0026] FIGS. 1A, 1B, and 1C illustrate a side view, a top view, and a perspective view respectively, of a weighted exercise sled, according to examples of the present disclosure;

[0027] FIG. 2 illustrates a top view of a weighted exercise wheel, according to examples of the present disclosure;

[0028] FIG. 3 illustrates a method performed for adjusting exercise load of a hollow wheel, according to examples of the present disclosure; and

[0029] FIGS. 4A, 4B, 4C, and 4D illustrate example exercises that can be performed using a weighted exercise sled or wheel, according to examples of the present disclosure.

[0030] The reference number for any illustrated element that appears in multiple different figures has the same meaning across the multiple figures, and the mention or discussion herein of any illustrated element in the context of any particular figure also applies to each other figure, if any, in which that same illustrated element is shown.DESCRIPTION

[0031] According to an aspect of the disclosure, a multifunctional exercise sled with an oblate spheroid wheel and dynamic inertial resistance is provided. Conventional fitness equipment often lacks versatility and adaptability, requiring users to rely on multiple pieces of equipment to achieve a comprehensive workout. These limitations can result in inefficient training, increased equipment clutter, and restricted exercise variety. The present disclosure may provide a multifunctional exercise sled featuring an oblate spheroid wheel with dynamic inertial resistance. By enabling a range of exercise modalities within a single apparatus and allowing for adjustable resistance, the present disclosure may offer enhanced training flexibility, improved user engagement, and more efficient use of space and resources.

[0032] The weighted exercise sled may be used for a variety of exercises, such as exercises typically performed using a sled, wheelbarrow, ab-roller, or any combination thereof. The weighted exercise sled includes shifting internal weights inside the wheel of the weighted exercise sled to enhance core stabilization during exercise. Unlike exercise sleds relying on magnetic or weighted friction-based resistance, this exercise sled provides resistance through dynamic inertial loading due to shifting internal mass. In some examples, belts or ropes may be attached to the weighted fitness sled to enable a user to perform additional exercises using the weighted fitness sled. Because the weighted exercise sled includes a wheel, noise and floor damage during use may be mitigated. In some examples, the resistance can be adjusted by adding or subtracting weight plates to the ends of the axle or to the frame.

[0033] FIGS. 1A, 1B, and 1C illustrate a side view, a top view, and a perspective view respectively, of a weighted exercise sled, according to examples of the present disclosure. Sled 100 may include frame 110, handles 120, skids 130, wheel 140, and axle 150. When a user interacts with sled 100 to perform an exercise, the user may push or pull sled 100 like a wheelbarrow. Alternatively, the user may attach a waist belt, rope, or strap to sled 100 and pull sled 100 like a sled.

[0034] Frame 110 may serve as the structural backbone connecting components of sled 100. Frame 110 may connect the components of sled 100 and be made of any suitable material to support the weight of the components of sled 100 and provide stability for sled 100. Examples of materials for frame 110 include metals such as steel (including carbon steel, stainless steel, and chromoly steel), aluminum and aluminum alloys, titanium and titanium alloys, and magnesium alloys; composite materials such as fiberglass-reinforced polymer and carbon-fiber-reinforced polymer; engineered polymers such as glass-filled nylon, polycarbonate, ABS, and acetal; and combinations thereof (e.g., a metal tubular frame with polymer brackets, handle mounts, skid mounts, or protective overmolded wear surfaces).

[0035] One end of frame 110 may be coupled to axle 150 and a second end of frame 110 may be coupled to handles 120. Frame 110 may also include a post (not expressly shown) to allow a user to add weight plates to frame 110 to increase the weight of sled 100. The post may have a diameter of approximately 1 inch (approximately 25 millimeters) or approximately 2 inches (approximately 50.6 millimeters) such that a standard or Olympic sized weight plate may be slid onto the post.

[0036] Frame 110 may include one or more anchor rings 114 for coupling other exercise equipment to sled 100. Anchor ring 114 may define an attachment point for a belt, strap, rope, cord, chain, handle, or other connector to enable pulling, dragging, towing, or resisted movement exercises. Anchor ring 114 may be positioned on any suitable portion of frame 110, including on a forward portion near wheel 140 and axle 150, on a mid-portion of frame 110, on a rearward portion near handle 120, or on cross bar 115.

[0037] Anchor ring 114 may be implemented using any suitable ring-type coupling element, including an eyelet, an eye-bolt, an eye nut, a D-ring, an O-ring, a triangular ring, a rectangular ring, a carabiner-receiving loop, a clevis, a clevis ring, a shackle interface, a hook-receiving loop, or any similar closed or partially closed loop structure configured to receive and retain a strap, rope, cord, or similar exercise equipment. In some examples, anchor ring 114 may be a continuous closed loop. In other examples, anchor ring 114 may include an opening, gate, or removable retaining member (e.g., a clevis pin or threaded fastener) to facilitate installation of a connector.

[0038] Anchor ring 114 may be rigid or semi-rigid. In some examples, anchor ring 114 may be formed of metal (e.g., steel, stainless steel, aluminum, or an alloy). In other examples, anchor ring 114 may be formed of a polymer, a composite, or a combination of materials. Anchor ring 114 may be coated (e.g., powder coated) or may include a corrosion-resistant finish. In some examples, anchor ring 114 may include a low-friction bushing or sleeve, or a wear surface, to reduce abrasion of the exercise equipment coupled to anchor ring 114.

[0039] Anchor ring 114 may be coupled to frame 110 in any suitable manner, including permanently, semi-permanently, or removably. In some examples, anchor ring 114 may be welded to frame 110. For example, anchor ring 114 may be welded directly to a tube or plate portion of frame 110, or welded to a welded-on tab, lug, or bracket that is itself welded to frame 110. In some examples, anchor ring 114 may be brazed or soldered to a metal frame or frame-mounted bracket and then may be coupled to frame 110.

[0040] In some examples, anchor ring 114 may be fastened to frame 110 using one or more mechanical fasteners. For example, anchor ring 114 may be bolted to frame 110 via a tab, bracket, or mounting plate using a bolt and nut, a threaded fastener, a shoulder bolt, a rivet, or a captive fastener. In some examples, anchor ring 114 may be an eyebolt that passes through an aperture in frame 110 or in a frame-mounted bracket and may be secured with a nut, jam nut, lock nut, or thread-locking feature. In some examples, anchor ring 114 may be mounted using a U-bolt, clamp, or band clamp around a tubular portion of frame 110. In some examples, anchor ring 114 may be secured using a quick-release pin, detent pin, or similar removable retention element to enable replacement or repositioning.

[0041] In some examples, anchor ring 114 may be formed integrally with a portion of frame 110. For example, anchor ring 114 may be formed as a bent portion of a metal rod or plate that is part of frame 110, or as a cutout or loop feature in a plate member of frame 110. In some examples, anchor ring 114 may be formed as a molded-in loop or embedded insert in a polymeric or composite component of frame 110.

[0042] In some examples, anchor ring 114 is coupled to frame 110 through an intermediate coupling member that provides a pivot or articulation. For example, anchor ring 114 may be mounted to a bracket via a pin, bolt, or rivet to allow the anchor ring to rotate or pivot relative to frame 110 to reduce twisting of an attached strap or rope. In some examples, anchor ring 114 may be coupled through a swivel joint.

[0043] In some examples, anchor ring 114 may be adjustable or repositionable relative to frame 110. For example, anchor ring 114 may be mounted to a slotted bracket, a series of mounting holes, or a track feature to allow selection among a plurality of mounting positions to change an effective pull direction, height, or leverage. While FIGS. 1A, 1B, and 1C illustrate one anchor ring 114, in some examples, sled 100 may include a plurality of anchor rings 114 positioned at different respective locations on frame 110 to enable alternative pulling configurations and attachment geometries.

[0044] Frame 110 may include cross bar 115 coupling the two sides of frame 110. Cross bar 115 may increase the stability and strength of frame 110 and prevent a user from falling towards wheel 140.

[0045] Handles 120 may be positioned at the rear of sled 100 and may allow a user to push or pull sled 100 during exercise. Handles 120 may be coupled to an end of frame 110 and may allow a user to push or pull sled 100. Handles 120 may have any suitable shape including, but not limited to, straight, curved, round, ring-like, or any combination thereof to facilitate ergonomic grip and maintain a neutral wrist position. For example, handles 120 may resemble the handles of a wheelbarrow. In other examples, handles 120 may have a ring shape to allow a user to maintain a neutral wrist position while pushing or pulling sled 100. Handles 120 may include one or more anchor rings for connecting waist belts, ropes, or straps to enable a user to perform pulling or dragging exercises. In some examples, handles 120 themselves may act as anchor rings. Handles 120 may be formed of any suitable material, including, but not limited to, steel, aluminum, composite, or any combination thereof. In some examples, handles 120 may be coated with a non-slip grip material to improve a user's grip when interacting with handles 120. Examples of non-slip grip materials include rubber (including natural rubber and synthetic rubber such as EPDM), thermoplastic elastomers (TPE), thermoplastic polyurethane (TPU), silicone rubber, neoprene, nitrile rubber (NBR), polyurethane foam, ethylene-vinyl acetate (EVA) foam, cork, knurled metal surfaces, textured or overmolded polymer sleeves (e.g., overmolded TPE on a rigid polymer or metal core), heat-shrink grip tubing, grip tape (including polyurethane or rubberized tape), and abrasion-resistant fabric sleeves (e.g., nylon or polyester) optionally including a textured or rubberized coating.

[0046] Handles 120 may be modified for storage or shipping of sled 100. For example, handles 120 may be collapsible, removable, or foldable to reduce the footprint of sled 100. In some examples, handles 120 may be coupled to frame 110 via a quick release mechanism to allow handles 120 to be reversibly removed from frame 110 or repositioned relative to frame 110. The quick release mechanism may be any suitable mechanism for reversibly attaching handles 120, such as but not limited to, quick-release pins, detent pins, ball-lock pins, spring-lock pins, clevis pins (optionally used with a cotter pin or retaining clip), hitch pins, lynch pins, R-clips (hairpin cotters), split pins (cotter pins), threaded fasteners (e.g., bolts or screws used with nuts, lock nuts, or wing nuts), thumb screws, hand knobs with threaded studs, cam-lock levers, over-center toggle latches, spring-loaded locking plungers, bayonet-style twist locks, and slide-and-lock dovetail or tongue-and-groove couplers with a set screw or latch.

[0047] Skids 130 may be attached to the lower portion of frame 110 and may provide stability to sled 100 when stationary, preventing excessive tipping during use. For example, skids 130 may support sled 100 when sled 100 is not in motion and keep sled 100 stable when in use by preventing sled 100 from tipping too far side to side. Examples of materials for skid 130 include steel (including stainless steel), aluminum, titanium, and other metal alloys; polymers such as high-density polyethylene (HDPE), ultra-high-molecular-weight polyethylene (UHMWPE), nylon (e.g., PA6 or PA66), acetal (POM / Delrin), polypropylene (PP), polycarbonate (PC), ABS, and polyurethane; elastomers such as rubber, EPDM, and thermoplastic elastomers (TPE); composites such as fiberglass-reinforced polymer or carbon-fiber-reinforced polymer; and combinations thereof (e.g., a metal skid body with a polymer or elastomer wear pad or overmolded contact surface).

[0048] Skids 130 may be adjustable to allow a user to change the height of handles 120 to accommodate users of various heights. For example, skids 130 may be lengthened to raise the height of handles 120 or shortened to lower the height of handles 120. As another example, skids 130 may be rotated relative to frame 110 to change the height of handles 120.

[0049] Additionally, skids 130 may support frame 110 for storage. For example, skids 130 may be rotated relative to frame 110 to allow sled 100 to be stored vertically against a wall. As described above, handles 120 may also rotate or lock in place to minimize the footprint of sled 100 during storage.

[0050] Wheel 140 may be positioned at the front of sled 100 and may be coupled to axle 150. Wheel 140 and rotate as sled 100 is pushed or pulled. Wheel 140 may be made of any suitable material including high-density polyethylene (HDPE), polyethylene (PE), polypropylene (PP), nylon (e.g., PA6 or PA66), acetal (POM / Delrin), polycarbonate (PC), ABS, polyurethane (including cast polyurethane or polyurethane tread overmold), glass-filled polymers (e.g., glass-filled nylon), fiber-reinforced composites (e.g., fiberglass-reinforced polymer or carbon-fiber-reinforced polymer), rubber or elastomeric materials for an outer tread layer, aluminum, steel, magnesium, and combinations thereof (e.g., a polymer shell with a metal hub or axle interface, or a polymer wheel with an overmolded elastomer tread). The material should provide durability to resist wear from use and damage from impacts.

[0051] Wheel 140 may be hollow, with an interior volume. The interior volume may be filled with a particulate material, including, but not limited to, sand, metals (including, but not limited to, iron and lead), metal shot, metal shavings, water, pebbles, beans, seeds, gravel, wood pellets, and various other liquids and granular materials (or combinations thereof). By filling the interior volume, wheel 140 may contribute to the weight of sled 100. The volume and mass of the particulate material may be reversibly adjusted by adding or subtracting particulate material from wheel 140. The movement of particulate material in wheel 140 may create a dynamic internal mass. The dynamic internal resistance may shift during use, (e.g., when a user tries to move sled 100) to test a user's ability to maintain stability during movement.

[0052] Wheel 140 may include fill port 170 to allow the particulate material to be added to or removed from the interior volume of wheel 140. Fill port 170 may be any suitable opening and closure to allow fill port 170 to be open and closed. For example, fill port 170 may have a threaded cap to allow a user to access the interior volume. In some examples, the cap may also include a seal, such as an O-ring, to prevent the particulate material from leaking from the interior volume. In other examples, fill port 170 may include a bayonet-style twist-lock cap, a quarter-turn cam-lock cap, a latch-retained cover (including an over-center latch), a hinged cover with a latch, a snap-fit plug, an interference-fit plug, a tapered plug, a press-in plug with an O-ring, a detent-retained plug, a plug retained by a cross-pin or cotter pin, a plug retained by a set screw, a captive plug (tethered to the wheel), a rotating shutter or slide gate, and a valve-type closure (e.g., a ball valve or check valve) for liquid fill embodiments.

[0053] Wheel 140 may be any suitable size based on the intended weight of wheel 140. For example, wheel 140 may have a diameter between approximately 15 and approximately 18 inches and a width between approximately 8 inches and approximately 12 inches. It will be understood that a smaller wheel 140 will be lighter than a larger wheel 140. Sled 100 may be designed such that one wheel 140 may be easily switched with another wheel 140. For example, a user may have one wheel 140 having a size corresponding to a weight of 10 pounds and a second wheel 140 having a size corresponding to 20 pounds. The user may switch the wheels based on the exercise the user is performing or the capabilities of different users who may use sled 100.

[0054] The thickness of the wall of wheel 140 may be any suitable thickness to support the weight of the particulate material in the interior volume of wheel 140. For example, the thickness may be between approximately 0.25 inches and approximately 0.375 inches. In some examples, the interior of wheel 140 may additionally include ribs to reinforce the walls of wheel 140 and increase the strength and durability of wheel 140.

[0055] Wheel 140 may have an oblate spherical shape. The shape may result in the user of sled 100 having to balance sled 100 during use, enhancing the effectiveness of the workout. For example, balancing sled 100 during use may enhance the core stabilization of the user. The material forming wheel 140 may be molded to form the shape of wheel 140.

[0056] In some examples, the external perimeter of wheel 140 may have a raised tread pattern to improve traction on floors, turf, or outdoor surfaces. The raised tread pattern may be added when wheel 140 is molded during manufacturing.

[0057] Axle 150 may pass through the center of wheel 140 and may facilitate free rotation. Axle 150 may be a central shaft coupled to frame 110 and wheel 140. Axle may be manufactured from any suitable material, such as steel or aluminum. Axle 150 may rotate as sled 100 is pushed or pulled and allow wheel 140 to move freely. The point at which axle 150 is coupled to frame 110 may include bearings to reduce friction and allow wheel 140 to rotate smoothly and efficiently. Axle 150 may extend beyond the width of wheel 140 and any portion of frame 110 coupled to axle 150 to allow weight plates to be added to axle 150 to increase the weight of sled 100 (shown in more detail in FIG. 2). In some examples, axle 150 may have a diameter of approximately 1 inch (approximately 25 millimeters) or approximately 2 inches (approximately 50.6 millimeters) such that a standard or Olympic sized weight plate may be slid onto axle 150. The weight plates may be secured on axle 150 with collars or clamps. The usage of weight plates is described in more detail with respect to FIG. 2.

[0058] Axle 150 may have any suitable cross-sectional shape, such as but not limited to, a circular (round) cross-section; an oval or elliptical cross-section; a polygonal cross-section such as triangular, square, rectangular, pentagonal, or hexagonal; a splined cross-section (external splines); a keyed cross-section (e.g., a round shaft with a keyway, a D-shaft, or a double-D shaft); and a lobed cross-section (e.g., multi-lobed profiles). In some examples, axle 150 is tubular (e.g., a hollow round tube) rather than solid, and may have a constant cross-section along its length or may be stepped to different diameters at different axial positions.

[0059] In some examples, axle 150 may include one or more anchor rings 152 for connecting waist belts, ropes, or straps to enable a user to perform pulling or dragging exercises. Anchor ring 152 may be similar to anchor ring 114. Anchor ring 152 may be coupled to axle 150 in any manner as described with respect to coupling anchor ring 114 to frame 110.

[0060] While sled 100 is shown in FIGS. 1A, 1B, and 1C as having a single wheel 140, in some examples, sled 100 may include more than one wheel 140. In these examples, wheels 140 may be positioned in tandem or parallel to each other. In some examples, sled 100 may have three wheels 140 arranged in a tricycle configuration. In other examples, sled 100 may have four wheels 140 arranged on four corners of sled 100.

[0061] In some examples, sled 100 may include sensors to measure the performance of the user while the user interacts with sled 100. For example, sled 100 may include one or more accelerometers, strain gauges, or force gauges to measure the force a user exerts on sled 100. Sled 100 may also include a magnet and sensor (e.g., a bicycle odometer) or optical sensor on wheel 140 and axle 150 to measure the speed and distance at which a user pushes or pulls sled 100.

[0062] FIG. 2 illustrates a top view of a weighted exercise wheel, according to examples of the present disclosure. Wheel system 200 may include wheel 240 and axle 250 which may be similar to wheel 140 and axle 150, respectively, shown in FIGS. 1A, 1B, and 1C. In some examples, wheel 240 and axle 250 may be detached from a frame, such as frame 110 shown in FIGS. 1A, 1B, and 1C, and used as a standalone device. For example, wheel 240 and axle 250 may be used as an abdominal roller.

[0063] A user may use a portion of axle extension 255 of axle 250 as handles 220 for the abdominal rolling exercises. In other examples, axle 250 may include one or more anchor rings 252. Anchor rings 252 may be used for connecting waist belts, ropes, or straps to enable a user to perform pulling or dragging exercises. Anchor ring 252 may be similar to anchor ring 114 shown in FIGS. 1A, 1B, and 1C. Anchor ring 252 may be coupled to axle 250 in any manner as described with respect to coupling anchor ring 114 to frame 110.

[0064] Anchor rings 252 may also allow a user to attach handles to axle 250. For example, handles 120 shown in FIGS. 1A, 1B, and 1C may be detachable from frame 110 (e.g., using any suitable mechanism for reversibly attaching handles 120, such as but not limited to, quick-release pins, detent pins, ball-lock pins, spring-lock pins, clevis pins (optionally used with a cotter pin or retaining clip), hitch pins, lynch pins, R-clips (hairpin cotters), split pins (cotter pins), threaded fasteners (e.g., bolts or screws used with nuts, lock nuts, or wing nuts), thumb screws, hand knobs with threaded studs, cam-lock levers, over-center toggle latches, spring-loaded locking plungers, bayonet-style twist locks, and slide-and-lock dovetail or tongue-and-groove couplers with a set screw or latch) and may be attached to axle 250.

[0065] Axle 250 may be similar to axle 150 shown in FIGS. 1A, 1B, and 1C. As described above, axle 250 may include axle extensions 255 to allow weight plates 260a and 260b to be added to axle 250 to increase the weight of wheel system 200. In some examples, axle 250 may have a diameter of approximately 1 inch (approximately 25 millimeters) or approximately 2 inches (approximately 50.6 millimeters) such that a standard or Olympic sized weight plate may be slid onto axle extensions 255. The weight plates may be secured on axle extensions 255 with collars or clamps.

[0066] Weight plates 260a and 260b may be a generally disk-shaped exercise weight configured for use with a barbell or other equipment having a standard or Olympic-sized sleeve. Weight plates 260a and 260b may include a central aperture having a nominal diameter corresponding to the diameter of axle extension 255, such that weight plates 260a and 260b may be slid onto axle extension 255. In some examples, weight plates 260a and 260b may be rigid and may be formed of cast iron, steel, or other dense material, and in some examples may include a protective or noise-reducing covering such as rubber, urethane, or another polymeric coating. In other examples, weight plates 260a and 260b may be deformable to provide a dynamic mass to further test a user's ability to maintain stability during movement.

[0067] In some examples, weight plates 260a and 260b may be hollow and may be filled with a particulate material, including, but not limited to, sand, metals (including, but not limited to, iron and lead), metal shot, metal shavings, water, pebbles, beans, seeds, gravel, wood pellets, and various other liquids and granular materials (or combinations thereof). By filling the interior volume of weight plates 260a and 260b, weight plates 260a and 260b may contribute to the weight of system 200. The volume and mass of the particulate material may be reversibly adjusted by adding or subtracting particulate material from weight plates 260a and 260b. The movement of particulate material in weight plates 260a and 260b may create a dynamic internal mass. The dynamic internal resistance may shift during use, (e.g., when a user tries to move sled 100) to test a user's ability to maintain stability during movement. In some examples, weight plates 260a and 260b may include a fill port (not expressly shown) to allow the particulate material to be added to or removed from the interior volume of weight plates 260a and 260b. The fill port may have a threaded cap to allow a user to access the interior volume. In some examples, the cap may also include a seal, such as an O-ring, to prevent the particulate material from leaking from the interior volume. In other examples, the fill port may include a bayonet-style twist-lock cap, a quarter-turn cam-lock cap, a latch-retained cover (including an over-center latch), a hinged cover with a latch, a snap-fit plug, an interference-fit plug, a tapered plug, a press-in plug with an O-ring, a detent-retained plug, a plug retained by a cross-pin or cotter pin, a plug retained by a set screw, a captive plug (tethered to the wheel), a rotating shutter or slide gate, and a valve-type closure (e.g., a ball valve or check valve) for liquid fill embodiments.

[0068] Weight plates 260a and 260b may be marked with a nominal weight value (e.g., in pounds and / or kilograms) and may include grip apertures, spokes, or a contoured perimeter to facilitate handling. The outer diameter and thickness of weight plates 260a and 260b may vary depending on the nominal weight and design (e.g., standard plates, bumper plates), while maintaining compatibility with axle extension 255.

[0069] In some examples, the diameter of axle 250 may vary along the length of axle 250. For example, axle extensions 255 may have a diameter corresponding to the inner diameter of weight plates 260a and 260b while the portion of axle 250 proximate to wheel 240 may have a different diameter.

[0070] In some examples, axle extension 255 may have a non-circular shape such that weight plates 260a and 260b rotate in sync with wheel 240. For example axle extension 255 may have any suitable cross-sectional shape, such as but not limited to, an oval or elliptical cross-section; a polygonal cross-section such as triangular, square, rectangular, pentagonal, or hexagonal; a splined cross-section (external splines); a keyed cross-section (e.g., a round shaft with a keyway, a D-shaft, or a double-D shaft); and a lobed cross-section (e.g., multi-lobed profiles).

[0071] Wheel 240 may be similar to wheel 140 shown in FIGS. 1A, 1B, and 1C. Wheel 240 may be hollow, with an interior volume. The interior volume of wheel 240 may be filled with a particulate material, including, but not limited to, sand, metals (including, but not limited to, iron and lead), metal shot, metal shavings, water, pebbles, beans, seeds, gravel, wood pellets, and various other liquids and granular materials (or combinations thereof).

[0072] Wheel 240 may include fill port 270 to allow the particulate material to be added to or removed from the interior volume of wheel 240 to increase or decrease the weight of wheel 240. Fill port 270 may be any suitable opening and closure to allow fill port 270 to be open and closed. For example, fill port 270 may have a threaded cap to allow a user to access the interior volume. In some examples, the cap may also include a seal, such as an O-ring, to prevent the particulate material from leaking from the interior volume. In other examples, fill port 270 may include a bayonet-style twist-lock cap, a quarter-turn cam-lock cap, a latch-retained cover (including an over-center latch), a hinged cover with a latch, a snap-fit plug, an interference-fit plug, a tapered plug, a press-in plug with an O-ring, a detent-retained plug, a plug retained by a cross-pin or cotter pin, a plug retained by a set screw, a captive plug (tethered to the wheel), a rotating shutter or slide gate, and a valve-type closure (e.g., a ball valve or check valve) for liquid fill embodiments.

[0073] Sled 100 and wheel system 200 may be used for a variety of exercises. For example, sled 100 may be used for a sled push exercise where a user stands behind sled 100, grips handles 120 and pushes sled 100 forward to roll wheel 140 along a surface. The shifting of the particulate material in wheel 140 may shift, requiring the user to stabilize the user's core during the exercise. A user may also face away from sled 100, grip handles 120 and push sled 100.

[0074] As another example, sled 100 may be used for a wheelbarrow carry exercise where the user lifts handles 120 and walks forward, pushing sled 100. The inertial of wheel 140 may require the user to stabilize sled 100 during the exercise.

[0075] As an additional example, wheel system 200 may be used for an abdominal rollout exercise. The user may kneel or stand and grasp axle extensions 255 and push when 240 back and forth across the floor. In addition to the standard benefits of an abdominal rollout exercise, the use of wheel system 200 with dynamic inertial resistance may require the user to engage the user's core to compensate for the moving and shifting of the particulate material in the inner volume of wheel 240.

[0076] As a further example of the utilization of dynamic inertial resistance, sled 100 may be used for pulling exercises. For example, a user may grip handles 120 and pull sled 100 while the user walks backwards. Additionally, or alternatively, a user may couple a strap or rope attached to a belt worn by the user to an anchor ring 114 or anchor ring 152 on sled 100 and walk forward or backwards to drag sled 100 across the floor. The user may also pull sled 100 using ropes coupled to an anchor ring 114 or anchor ring 152 with the user's hands for an upper body exercise.

[0077] FIG. 3 illustrates a method performed for adjusting exercise load of a hollow wheel, according to examples of the present disclosure. Method 300 may be implemented using a fitness sled, such as sled 100 or wheel system 200 or any other system operable to implement method 300. Although examples have been described above, other variations and examples may be made from this disclosure without departing from the spirit and scope of these disclosed examples.

[0078] Method 300 may begin at block 310 where a fill port (e.g., fill port 170 or fill port 270) of a hollow wheel (e.g., wheel 140 or wheel 240) may be opened. The fill port may provide access to an interior volume of the hollow wheel, which may be configured to house particulate material.

[0079] At block 320, particulate material may be added or removed through the fill port to vary a mass within the interior volume. Particulate material may include, for example, sand, metals (including, but not limited to, iron and lead), metal shot, metal shavings, water, pebbles, beans, seeds, gravel, wood pellets, and various other liquids and granular materials (or combinations thereof). Adjusting the mass of the particulate material may alter dynamic inertial resistance of the hollow wheel.

[0080] At block 330, the fill port may be closed. Closing the fill port may inhibit leakage of particulate material from the interior volume during use. The fill port may include any suitable closure to allow the fill port to be open and closed. For example, the fill port may have a threaded cap to allow a user to access the interior volume. In some examples, the cap may also include a seal, such as an O-ring, to prevent the particulate material from leaking from the interior volume. In other examples, the fill port may include a bayonet-style twist-lock cap, a quarter-turn cam-lock cap, a latch-retained cover (including an over-center latch), a hinged cover with a latch, a snap-fit plug, an interference-fit plug, a tapered plug, a press-in plug with an O-ring, a detent-retained plug, a plug retained by a cross-pin or cotter pin, a plug retained by a set screw, a captive plug (tethered to the wheel), a rotating shutter or slide gate, and a valve-type closure (e.g., a ball valve or check valve) for liquid fill embodiments.

[0081] At block 340, one or more weight plates (e.g., weight plates 260a and 260b shown in FIG. 2) may be mounted or removed on portions of an axle (e.g., axle 150 or axle 250) passing through a center of the hollow wheel and extending beyond a width of the hollow wheel. The axle may be configured to receive standard or Olympic-sized weight plates, which may be secured using collars or clamps.

[0082] Although FIG. 3 discloses a particular number of operations related to method 300, method 300 may be executed with greater or fewer operations than those depicted in FIG. 3. In addition, although FIG. 3 discloses a certain order of operations to be taken with respect to method 300, the operations comprising method 300 may be completed in any suitable order.

[0083] FIGS. 4A, 4B, 4C, and 4D illustrate example exercises that can be performed using a weighted exercise sled or wheel, according to examples of the present disclosure. FIG. 4A illustrates an exercise performed using a weighted exercise sled. In exercise 400, a user may position behind the sled and may engage the handles (e.g., handles 120 shown in FIGS. 1A, 1B, and 1C) to push the weighted exercise sled along a surface while the wheel (e.g., wheel 140 shown in FIGS. 1A, 1B, and 1C) rolls. Because exercise 400 is performed without lifting shown the weighted exercise sled, a skid on the weighted exercise sled (e.g., skid 130 shown in FIGS. 1A, 1B, and 1C) may remain available to limit side-to-side tipping and to stabilize apparatus during initiation, deceleration, or interruption of motion.

[0084] FIG. 4B depicts exercise 410, in which the weighted exercise sled can be engaged in a carrying the weighted exercise sled in a wheelbarrow configuration. Exercise 410 can be performed by a user lifting the handles of the weighted exercise sled relative to a surface so that at least a portion of the frame (e.g., frame 110 shown in FIGS. 1A, 1B, and 1C) and skids of the weighted exercise sled are elevated while the hollow wheel remains in contact with the surface. The handles may transmit lifting and steering input from the user to the frame, and the frame may transfer load to the axle and the hollow wheel. As the hollow wheel rolls, the weighted exercise sled may be advanced in a forward direction in a manner similar to carrying the sled in a wheelbarrow configuration.

[0085] FIG. 4C illustrates moving the weighted exercise sled using a rope coupled to one or more anchor rings. In exercise 420, the weighted exercise sled may move along a surface while the hollow wheel rolls and while particulate material disposed within interior volume of the hollow wheel shifts to provide dynamic inertial resistance. Exercise 420 may be performed with rope coupled to an anchor ring (e.g., anchor ring 114 or 152 shown in FIGS. 1A, 1B, and 1C) so that pulling force applied by hands of the user may be transferred through the frame to the axle and the hollow wheel. In some examples, the rope may be coupled to one of anchor rings positioned on the frame. In other examples, the handles may include one or more anchor rings for connecting waist belts, ropes, or straps, such that the rope may be coupled on or near the handles. As the user pulls the rope, the weighted exercise sled may travel across the surface in a dragging or towing movement while the hollow wheel remains in rolling contact with the surface.

[0086] In some examples, exercise 420 may be performed while the user faces the weighted exercise sled and pulls rope with the user's hands for an upper body exercise. The user may step rearward while maintaining tension in the rope so that the weighted exercise sled moves toward the user. In other examples, the user may face away from the the weighted exercise sled and push against the ropes, stepping forward to pull the weighted exercise sled behind the user. The user may change hand position, body posture, pulling angle, or travel distance to vary loading characteristics of exercise 420 while maintaining rope coupled to the anchor ring.

[0087] FIG. 4D illustrates an abdominal rollout exercise according to examples of the present disclosure. Exercise 430 may depict the weighted exercise wheel (e.g., weighted exercise wheel 200 shown in FIG. 2) positioned on a surface and engaged by a user in an ab-roller configuration. Exercise 430 may be performed by a user kneeling or standing and grasping axle extensions or handles (e.g., axle extensions 255 or handles 220 shown in FIG. 2) on opposite sides of the hollowing wheel while the weighted exercise wheel along the surface. The axle and the axle extensions may allow the weighted exercise wheel to move freely along the surface.

[0088] Exercises 400, 410, 420, and 430 may provide dynamic inertial resistance because particulate material within internal volume of the hollow wheel may shift during rolling movement. As the hollow wheel rotates, shifting particulate material may alter a center of mass of rolling fitness apparatus and may increase stabilization demand on the user. Exercises 400, 410, 420, and 430 may engage upper body musculature, trunk musculature, and lower body musculature while user controls rope tension and movement of the weighted exercise sled.

[0089] Exercises 400, 410, 420, and 430 may be performed with different exercise load conditions. For example, particulate material may be added through a fill port (e.g., fill port 170 shown in FIGS. 1A, 1B, and 1C) or removed through the fill port to vary mass within internal volume of the hollow wheel, and one or more weight plates may be mounted on portions of an axle (e.g., axle 150 shown in FIGS. 1A, 1B, and 1C) extending beyond a width of the hollow wheel. These adjustments may allow exercises 400, 410, 420, and 430 to be adapted for different users, training intensities, and workout progressions while maintaining a pushing movement pattern using the weighted exercise sled.

[0090] Although examples have been described above, other variations and examples may be made from this disclosure without departing from the spirit and scope of these disclosed examples. The scope of the described subject matter encompasses variations, modifications, and alternative arrangements that align with the principles disclosed.

[0091] Certain well-understood details, such as standard manufacturing techniques, material properties, or common fitness equipment features, may be omitted for clarity and brevity. It is to be understood that the described subject matter is adaptable to various implementations, including changes in dimensions, materials, or component arrangements, without departing from the intended purpose. The examples provided herein are illustrative and are not to be construed as all-encompassing or restrictive, as the described subject matter allows for numerous adaptations within the scope of the claims.

Examples

Embodiment Construction

[0031]According to an aspect of the disclosure, a multifunctional exercise sled with an oblate spheroid wheel and dynamic inertial resistance is provided. Conventional fitness equipment often lacks versatility and adaptability, requiring users to rely on multiple pieces of equipment to achieve a comprehensive workout. These limitations can result in inefficient training, increased equipment clutter, and restricted exercise variety. The present disclosure may provide a multifunctional exercise sled featuring an oblate spheroid wheel with dynamic inertial resistance. By enabling a range of exercise modalities within a single apparatus and allowing for adjustable resistance, the present disclosure may offer enhanced training flexibility, improved user engagement, and more efficient use of space and resources.

[0032]The weighted exercise sled may be used for a variety of exercises, such as exercises typically performed using a sled, wheelbarrow, ab-roller, or any combination thereof. The...

PRIORITY

[0001] This application claims priority to U.S. Provisional Patent Application No. 63 / 781,722, filed Apr. 1, 2025, the contents of which are hereby incorporated in their entirety.TECHNICAL FIELD

[0002] The present disclosure relates to the field of weight training and physical conditioning. More specifically, the present disclosure relates to a multifunctional exercise sled with an oblate spheroid wheel and dynamic inertial resistance.BACKGROUND

[0003] The field of strength training and physical conditioning utilizes a variety of equipment such as sleds, wheelbarrows, ab-rollers, kettlebells, and pulling systems to target muscular power, endurance, and stability. For example, an exercise sled is a piece of fitness equipment used for strength and conditioning workouts. It typically consists of a flat platform or base, often made of metal or plastic, with a harness or straps attached for pulling or pushing. Some sleds have handles for pushing. Some sleds have one or more wheels. A user may load the sled with weights and push or pull the sled during a workout. While this equipment supports specific exercise modalities—pushing, pulling, carrying, rolling, and dragging—users often require multiple devices to achieve comprehensive workouts. Existing solutions may lack versatility, offer only static resistance, or produce excessive noise and surface wear, limiting their effectiveness in modern training environments.

[0004] Traditional fitness equipment often relies on friction-based resistance, static loads, or fixed-weight designs, which can result in inconsistent performance, increased noise, and potential damage to flooring surfaces. The use of multiple separate devices for different exercise modalities can also contribute to facility clutter and inefficient workout transitions, presenting challenges for both commercial and home fitness environments.SUMMARY OF THE INVENTION

[0005] Aspects provide systems and methods for a multifunctional exercise sled with an oblate spheroid wheel and dynamic inertial resistance. Examples of the present disclosure may include an apparatus. The apparatus may include a hollow wheel having an internal volume. The hollow wheel may house a particulate material in the internal volume. The apparatus may also include an axle passing through the center of the hollow wheel. The apparatus may further include a frame coupled to the axle. The apparatus may also include a handle coupled to an end of the frame opposite the axle. The apparatus may further include a skid coupled to the frame to support the handle.

[0006] In combination with any of the above examples, the hollow wheel may have an oblate spheroid shape.

[0007] In combination with any of the above examples, the apparatus may include a fill port in the hollow wheel to allow the particulate material to be added to or removed from the internal volume.

[0008] In combination with any of the above examples, the fill port may include a threaded cap. The fill port may also include a seal to prevent leakage of the particulate material from the internal volume.

[0009] In combination with any of the above examples, the apparatus may include an anchor ring coupled to the frame.

[0010] In combination with any of the above examples, the axle may extend beyond a width of the hollow wheel to receive and secure weight plates.

[0011] In combination with any of the above examples, the hollow wheel may include a raised tread pattern on an external surface of the hollow wheel.

[0012] In combination with any of the above examples, the hollow wheel may include an internal rib to reinforce a wall of the hollow wheel.

[0013] In combination with any of the above examples, the handle may be removably coupled to the frame via a quick-release pin.

[0014] In combination with any of the above examples, the skid may be rotatable relative to the frame to enable vertical storage of the apparatus.

[0015] In combination with any of the above examples, the handle may be lockable in an upright position to enable vertical storage of the apparatus.

[0016] Alone or in combination with any of the above examples, examples of the present disclosure may include an apparatus. The apparatus may include a hollow wheel having an internal volume. The hollow wheel may house a particulate material in the internal volume. The apparatus may also include an axle passing through the center of the hollow wheel. The axle may extend beyond a width of the hollow wheel to form a first hand grip on a first side of the hollow wheel and a second hand grip on a second side of the hollow wheel.

[0017] In combination with any of the above examples, the hollow wheel may have an oblate spheroid shape.

[0018] In combination with any of the above examples, the apparatus may include a fill port in the hollow wheel to allow the particulate material to be added to or removed from the internal volume. The fill port may include a threaded cap. The fill port may also include a seal to prevent leakage of the particulate material from the internal volume.

[0019] In combination with any of the above examples, portions of the axle extending beyond the width of the hollow wheel may receive and secure weight plates.

[0020] In combination with any of the above examples, the hollow wheel may include a raised tread pattern on an external surface of the hollow wheel.

[0021] In combination with any of the above examples, the hollow wheel may include an internal rib to reinforce a wall of the hollow wheel.

[0022] Alone or in combination with any of the above examples, examples of the present disclosure may include a method of exercising. The method may include performing an exercise using a rolling fitness apparatus. The rolling fitness apparatus may include a hollow wheel defining an interior volume. The rolling fitness apparatus may also include a particulate material disposed within the interior volume. The exercise may include rolling the hollow wheel along a surface. The particulate material may shift within the interior volume during the exercise to provide dynamic inertial resistance.

[0023] In combination with any of the above examples, the method may further include adjusting an exercise load of the rolling fitness apparatus. Adjusting the exercise load of the rolling fitness apparatus may include at least one of adding the particulate material through a fill port in the hollow wheel, removing the particulate material through the fill port, mounting at least one weight plate on a portion of an axle passing through a center of the hollow wheel and extending beyond a width of the hollow wheel, or removing at least one weight plate on the portion of the axle passing through the center of the hollow wheel and extending beyond the width of the hollow wheel.

[0024] In combination with any of the above examples, the exercise may include at least one of pushing a sled including the hollow wheel along the surface, carrying the sled in a wheelbarrow configuration, moving the sled using a rope coupled to an anchor ring, or performing an abdominal rollout by grasping one or more axle portions extending beyond a width of the hollow wheel.BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The figures illustrate examples of systems and methods for a multifunctional exercise sled with an oblate spheroid wheel and dynamic inertial resistance.

[0026] FIGS. 1A, 1B, and 1C illustrate a side view, a top view, and a perspective view respectively, of a weighted exercise sled, according to examples of the present disclosure;

[0027] FIG. 2 illustrates a top view of a weighted exercise wheel, according to examples of the present disclosure;

[0028] FIG. 3 illustrates a method performed for adjusting exercise load of a hollow wheel, according to examples of the present disclosure; and

[0029] FIGS. 4A, 4B, 4C, and 4D illustrate example exercises that can be performed using a weighted exercise sled or wheel, according to examples of the present disclosure.

[0030] The reference number for any illustrated element that appears in multiple different figures has the same meaning across the multiple figures, and the mention or discussion herein of any illustrated element in the context of any particular figure also applies to each other figure, if any, in which that same illustrated element is shown.DESCRIPTION

[0031] According to an aspect of the disclosure, a multifunctional exercise sled with an oblate spheroid wheel and dynamic inertial resistance is provided. Conventional fitness equipment often lacks versatility and adaptability, requiring users to rely on multiple pieces of equipment to achieve a comprehensive workout. These limitations can result in inefficient training, increased equipment clutter, and restricted exercise variety. The present disclosure may provide a multifunctional exercise sled featuring an oblate spheroid wheel with dynamic inertial resistance. By enabling a range of exercise modalities within a single apparatus and allowing for adjustable resistance, the present disclosure may offer enhanced training flexibility, improved user engagement, and more efficient use of space and resources.

[0032] The weighted exercise sled may be used for a variety of exercises, such as exercises typically performed using a sled, wheelbarrow, ab-roller, or any combination thereof. The weighted exercise sled includes shifting internal weights inside the wheel of the weighted exercise sled to enhance core stabilization during exercise. Unlike exercise sleds relying on magnetic or weighted friction-based resistance, this exercise sled provides resistance through dynamic inertial loading due to shifting internal mass. In some examples, belts or ropes may be attached to the weighted fitness sled to enable a user to perform additional exercises using the weighted fitness sled. Because the weighted exercise sled includes a wheel, noise and floor damage during use may be mitigated. In some examples, the resistance can be adjusted by adding or subtracting weight plates to the ends of the axle or to the frame.

[0033] FIGS. 1A, 1B, and 1C illustrate a side view, a top view, and a perspective view respectively, of a weighted exercise sled, according to examples of the present disclosure. Sled 100 may include frame 110, handles 120, skids 130, wheel 140, and axle 150. When a user interacts with sled 100 to perform an exercise, the user may push or pull sled 100 like a wheelbarrow. Alternatively, the user may attach a waist belt, rope, or strap to sled 100 and pull sled 100 like a sled.

[0034] Frame 110 may serve as the structural backbone connecting components of sled 100. Frame 110 may connect the components of sled 100 and be made of any suitable material to support the weight of the components of sled 100 and provide stability for sled 100. Examples of materials for frame 110 include metals such as steel (including carbon steel, stainless steel, and chromoly steel), aluminum and aluminum alloys, titanium and titanium alloys, and magnesium alloys; composite materials such as fiberglass-reinforced polymer and carbon-fiber-reinforced polymer; engineered polymers such as glass-filled nylon, polycarbonate, ABS, and acetal; and combinations thereof (e.g., a metal tubular frame with polymer brackets, handle mounts, skid mounts, or protective overmolded wear surfaces).

[0035] One end of frame 110 may be coupled to axle 150 and a second end of frame 110 may be coupled to handles 120. Frame 110 may also include a post (not expressly shown) to allow a user to add weight plates to frame 110 to increase the weight of sled 100. The post may have a diameter of approximately 1 inch (approximately 25 millimeters) or approximately 2 inches (approximately 50.6 millimeters) such that a standard or Olympic sized weight plate may be slid onto the post.

[0036] Frame 110 may include one or more anchor rings 114 for coupling other exercise equipment to sled 100. Anchor ring 114 may define an attachment point for a belt, strap, rope, cord, chain, handle, or other connector to enable pulling, dragging, towing, or resisted movement exercises. Anchor ring 114 may be positioned on any suitable portion of frame 110, including on a forward portion near wheel 140 and axle 150, on a mid-portion of frame 110, on a rearward portion near handle 120, or on cross bar 115.

[0037] Anchor ring 114 may be implemented using any suitable ring-type coupling element, including an eyelet, an eye-bolt, an eye nut, a D-ring, an O-ring, a triangular ring, a rectangular ring, a carabiner-receiving loop, a clevis, a clevis ring, a shackle interface, a hook-receiving loop, or any similar closed or partially closed loop structure configured to receive and retain a strap, rope, cord, or similar exercise equipment. In some examples, anchor ring 114 may be a continuous closed loop. In other examples, anchor ring 114 may include an opening, gate, or removable retaining member (e.g., a clevis pin or threaded fastener) to facilitate installation of a connector.

[0038] Anchor ring 114 may be rigid or semi-rigid. In some examples, anchor ring 114 may be formed of metal (e.g., steel, stainless steel, aluminum, or an alloy). In other examples, anchor ring 114 may be formed of a polymer, a composite, or a combination of materials. Anchor ring 114 may be coated (e.g., powder coated) or may include a corrosion-resistant finish. In some examples, anchor ring 114 may include a low-friction bushing or sleeve, or a wear surface, to reduce abrasion of the exercise equipment coupled to anchor ring 114.

[0039] Anchor ring 114 may be coupled to frame 110 in any suitable manner, including permanently, semi-permanently, or removably. In some examples, anchor ring 114 may be welded to frame 110. For example, anchor ring 114 may be welded directly to a tube or plate portion of frame 110, or welded to a welded-on tab, lug, or bracket that is itself welded to frame 110. In some examples, anchor ring 114 may be brazed or soldered to a metal frame or frame-mounted bracket and then may be coupled to frame 110.

[0040] In some examples, anchor ring 114 may be fastened to frame 110 using one or more mechanical fasteners. For example, anchor ring 114 may be bolted to frame 110 via a tab, bracket, or mounting plate using a bolt and nut, a threaded fastener, a shoulder bolt, a rivet, or a captive fastener. In some examples, anchor ring 114 may be an eyebolt that passes through an aperture in frame 110 or in a frame-mounted bracket and may be secured with a nut, jam nut, lock nut, or thread-locking feature. In some examples, anchor ring 114 may be mounted using a U-bolt, clamp, or band clamp around a tubular portion of frame 110. In some examples, anchor ring 114 may be secured using a quick-release pin, detent pin, or similar removable retention element to enable replacement or repositioning.

[0041] In some examples, anchor ring 114 may be formed integrally with a portion of frame 110. For example, anchor ring 114 may be formed as a bent portion of a metal rod or plate that is part of frame 110, or as a cutout or loop feature in a plate member of frame 110. In some examples, anchor ring 114 may be formed as a molded-in loop or embedded insert in a polymeric or composite component of frame 110.

[0042] In some examples, anchor ring 114 is coupled to frame 110 through an intermediate coupling member that provides a pivot or articulation. For example, anchor ring 114 may be mounted to a bracket via a pin, bolt, or rivet to allow the anchor ring to rotate or pivot relative to frame 110 to reduce twisting of an attached strap or rope. In some examples, anchor ring 114 may be coupled through a swivel joint.

[0043] In some examples, anchor ring 114 may be adjustable or repositionable relative to frame 110. For example, anchor ring 114 may be mounted to a slotted bracket, a series of mounting holes, or a track feature to allow selection among a plurality of mounting positions to change an effective pull direction, height, or leverage. While FIGS. 1A, 1B, and 1C illustrate one anchor ring 114, in some examples, sled 100 may include a plurality of anchor rings 114 positioned at different respective locations on frame 110 to enable alternative pulling configurations and attachment geometries.

[0044] Frame 110 may include cross bar 115 coupling the two sides of frame 110. Cross bar 115 may increase the stability and strength of frame 110 and prevent a user from falling towards wheel 140.

[0045] Handles 120 may be positioned at the rear of sled 100 and may allow a user to push or pull sled 100 during exercise. Handles 120 may be coupled to an end of frame 110 and may allow a user to push or pull sled 100. Handles 120 may have any suitable shape including, but not limited to, straight, curved, round, ring-like, or any combination thereof to facilitate ergonomic grip and maintain a neutral wrist position. For example, handles 120 may resemble the handles of a wheelbarrow. In other examples, handles 120 may have a ring shape to allow a user to maintain a neutral wrist position while pushing or pulling sled 100. Handles 120 may include one or more anchor rings for connecting waist belts, ropes, or straps to enable a user to perform pulling or dragging exercises. In some examples, handles 120 themselves may act as anchor rings. Handles 120 may be formed of any suitable material, including, but not limited to, steel, aluminum, composite, or any combination thereof. In some examples, handles 120 may be coated with a non-slip grip material to improve a user's grip when interacting with handles 120. Examples of non-slip grip materials include rubber (including natural rubber and synthetic rubber such as EPDM), thermoplastic elastomers (TPE), thermoplastic polyurethane (TPU), silicone rubber, neoprene, nitrile rubber (NBR), polyurethane foam, ethylene-vinyl acetate (EVA) foam, cork, knurled metal surfaces, textured or overmolded polymer sleeves (e.g., overmolded TPE on a rigid polymer or metal core), heat-shrink grip tubing, grip tape (including polyurethane or rubberized tape), and abrasion-resistant fabric sleeves (e.g., nylon or polyester) optionally including a textured or rubberized coating.

[0046] Handles 120 may be modified for storage or shipping of sled 100. For example, handles 120 may be collapsible, removable, or foldable to reduce the footprint of sled 100. In some examples, handles 120 may be coupled to frame 110 via a quick release mechanism to allow handles 120 to be reversibly removed from frame 110 or repositioned relative to frame 110. The quick release mechanism may be any suitable mechanism for reversibly attaching handles 120, such as but not limited to, quick-release pins, detent pins, ball-lock pins, spring-lock pins, clevis pins (optionally used with a cotter pin or retaining clip), hitch pins, lynch pins, R-clips (hairpin cotters), split pins (cotter pins), threaded fasteners (e.g., bolts or screws used with nuts, lock nuts, or wing nuts), thumb screws, hand knobs with threaded studs, cam-lock levers, over-center toggle latches, spring-loaded locking plungers, bayonet-style twist locks, and slide-and-lock dovetail or tongue-and-groove couplers with a set screw or latch.

[0047] Skids 130 may be attached to the lower portion of frame 110 and may provide stability to sled 100 when stationary, preventing excessive tipping during use. For example, skids 130 may support sled 100 when sled 100 is not in motion and keep sled 100 stable when in use by preventing sled 100 from tipping too far side to side. Examples of materials for skid 130 include steel (including stainless steel), aluminum, titanium, and other metal alloys; polymers such as high-density polyethylene (HDPE), ultra-high-molecular-weight polyethylene (UHMWPE), nylon (e.g., PA6 or PA66), acetal (POM / Delrin), polypropylene (PP), polycarbonate (PC), ABS, and polyurethane; elastomers such as rubber, EPDM, and thermoplastic elastomers (TPE); composites such as fiberglass-reinforced polymer or carbon-fiber-reinforced polymer; and combinations thereof (e.g., a metal skid body with a polymer or elastomer wear pad or overmolded contact surface).

[0048] Skids 130 may be adjustable to allow a user to change the height of handles 120 to accommodate users of various heights. For example, skids 130 may be lengthened to raise the height of handles 120 or shortened to lower the height of handles 120. As another example, skids 130 may be rotated relative to frame 110 to change the height of handles 120.

[0049] Additionally, skids 130 may support frame 110 for storage. For example, skids 130 may be rotated relative to frame 110 to allow sled 100 to be stored vertically against a wall. As described above, handles 120 may also rotate or lock in place to minimize the footprint of sled 100 during storage.

[0050] Wheel 140 may be positioned at the front of sled 100 and may be coupled to axle 150. Wheel 140 and rotate as sled 100 is pushed or pulled. Wheel 140 may be made of any suitable material including high-density polyethylene (HDPE), polyethylene (PE), polypropylene (PP), nylon (e.g., PA6 or PA66), acetal (POM / Delrin), polycarbonate (PC), ABS, polyurethane (including cast polyurethane or polyurethane tread overmold), glass-filled polymers (e.g., glass-filled nylon), fiber-reinforced composites (e.g., fiberglass-reinforced polymer or carbon-fiber-reinforced polymer), rubber or elastomeric materials for an outer tread layer, aluminum, steel, magnesium, and combinations thereof (e.g., a polymer shell with a metal hub or axle interface, or a polymer wheel with an overmolded elastomer tread). The material should provide durability to resist wear from use and damage from impacts.

[0051] Wheel 140 may be hollow, with an interior volume. The interior volume may be filled with a particulate material, including, but not limited to, sand, metals (including, but not limited to, iron and lead), metal shot, metal shavings, water, pebbles, beans, seeds, gravel, wood pellets, and various other liquids and granular materials (or combinations thereof). By filling the interior volume, wheel 140 may contribute to the weight of sled 100. The volume and mass of the particulate material may be reversibly adjusted by adding or subtracting particulate material from wheel 140. The movement of particulate material in wheel 140 may create a dynamic internal mass. The dynamic internal resistance may shift during use, (e.g., when a user tries to move sled 100) to test a user's ability to maintain stability during movement.

[0052] Wheel 140 may include fill port 170 to allow the particulate material to be added to or removed from the interior volume of wheel 140. Fill port 170 may be any suitable opening and closure to allow fill port 170 to be open and closed. For example, fill port 170 may have a threaded cap to allow a user to access the interior volume. In some examples, the cap may also include a seal, such as an O-ring, to prevent the particulate material from leaking from the interior volume. In other examples, fill port 170 may include a bayonet-style twist-lock cap, a quarter-turn cam-lock cap, a latch-retained cover (including an over-center latch), a hinged cover with a latch, a snap-fit plug, an interference-fit plug, a tapered plug, a press-in plug with an O-ring, a detent-retained plug, a plug retained by a cross-pin or cotter pin, a plug retained by a set screw, a captive plug (tethered to the wheel), a rotating shutter or slide gate, and a valve-type closure (e.g., a ball valve or check valve) for liquid fill embodiments.

[0053] Wheel 140 may be any suitable size based on the intended weight of wheel 140. For example, wheel 140 may have a diameter between approximately 15 and approximately 18 inches and a width between approximately 8 inches and approximately 12 inches. It will be understood that a smaller wheel 140 will be lighter than a larger wheel 140. Sled 100 may be designed such that one wheel 140 may be easily switched with another wheel 140. For example, a user may have one wheel 140 having a size corresponding to a weight of 10 pounds and a second wheel 140 having a size corresponding to 20 pounds. The user may switch the wheels based on the exercise the user is performing or the capabilities of different users who may use sled 100.

[0054] The thickness of the wall of wheel 140 may be any suitable thickness to support the weight of the particulate material in the interior volume of wheel 140. For example, the thickness may be between approximately 0.25 inches and approximately 0.375 inches. In some examples, the interior of wheel 140 may additionally include ribs to reinforce the walls of wheel 140 and increase the strength and durability of wheel 140.

[0055] Wheel 140 may have an oblate spherical shape. The shape may result in the user of sled 100 having to balance sled 100 during use, enhancing the effectiveness of the workout. For example, balancing sled 100 during use may enhance the core stabilization of the user. The material forming wheel 140 may be molded to form the shape of wheel 140.

[0056] In some examples, the external perimeter of wheel 140 may have a raised tread pattern to improve traction on floors, turf, or outdoor surfaces. The raised tread pattern may be added when wheel 140 is molded during manufacturing.

[0057] Axle 150 may pass through the center of wheel 140 and may facilitate free rotation. Axle 150 may be a central shaft coupled to frame 110 and wheel 140. Axle may be manufactured from any suitable material, such as steel or aluminum. Axle 150 may rotate as sled 100 is pushed or pulled and allow wheel 140 to move freely. The point at which axle 150 is coupled to frame 110 may include bearings to reduce friction and allow wheel 140 to rotate smoothly and efficiently. Axle 150 may extend beyond the width of wheel 140 and any portion of frame 110 coupled to axle 150 to allow weight plates to be added to axle 150 to increase the weight of sled 100 (shown in more detail in FIG. 2). In some examples, axle 150 may have a diameter of approximately 1 inch (approximately 25 millimeters) or approximately 2 inches (approximately 50.6 millimeters) such that a standard or Olympic sized weight plate may be slid onto axle 150. The weight plates may be secured on axle 150 with collars or clamps. The usage of weight plates is described in more detail with respect to FIG. 2.

[0058] Axle 150 may have any suitable cross-sectional shape, such as but not limited to, a circular (round) cross-section; an oval or elliptical cross-section; a polygonal cross-section such as triangular, square, rectangular, pentagonal, or hexagonal; a splined cross-section (external splines); a keyed cross-section (e.g., a round shaft with a keyway, a D-shaft, or a double-D shaft); and a lobed cross-section (e.g., multi-lobed profiles). In some examples, axle 150 is tubular (e.g., a hollow round tube) rather than solid, and may have a constant cross-section along its length or may be stepped to different diameters at different axial positions.

[0059] In some examples, axle 150 may include one or more anchor rings 152 for connecting waist belts, ropes, or straps to enable a user to perform pulling or dragging exercises. Anchor ring 152 may be similar to anchor ring 114. Anchor ring 152 may be coupled to axle 150 in any manner as described with respect to coupling anchor ring 114 to frame 110.

[0060] While sled 100 is shown in FIGS. 1A, 1B, and 1C as having a single wheel 140, in some examples, sled 100 may include more than one wheel 140. In these examples, wheels 140 may be positioned in tandem or parallel to each other. In some examples, sled 100 may have three wheels 140 arranged in a tricycle configuration. In other examples, sled 100 may have four wheels 140 arranged on four corners of sled 100.

[0061] In some examples, sled 100 may include sensors to measure the performance of the user while the user interacts with sled 100. For example, sled 100 may include one or more accelerometers, strain gauges, or force gauges to measure the force a user exerts on sled 100. Sled 100 may also include a magnet and sensor (e.g., a bicycle odometer) or optical sensor on wheel 140 and axle 150 to measure the speed and distance at which a user pushes or pulls sled 100.

[0062] FIG. 2 illustrates a top view of a weighted exercise wheel, according to examples of the present disclosure. Wheel system 200 may include wheel 240 and axle 250 which may be similar to wheel 140 and axle 150, respectively, shown in FIGS. 1A, 1B, and 1C. In some examples, wheel 240 and axle 250 may be detached from a frame, such as frame 110 shown in FIGS. 1A, 1B, and 1C, and used as a standalone device. For example, wheel 240 and axle 250 may be used as an abdominal roller.

[0063] A user may use a portion of axle extension 255 of axle 250 as handles 220 for the abdominal rolling exercises. In other examples, axle 250 may include one or more anchor rings 252. Anchor rings 252 may be used for connecting waist belts, ropes, or straps to enable a user to perform pulling or dragging exercises. Anchor ring 252 may be similar to anchor ring 114 shown in FIGS. 1A, 1B, and 1C. Anchor ring 252 may be coupled to axle 250 in any manner as described with respect to coupling anchor ring 114 to frame 110.

[0064] Anchor rings 252 may also allow a user to attach handles to axle 250. For example, handles 120 shown in FIGS. 1A, 1B, and 1C may be detachable from frame 110 (e.g., using any suitable mechanism for reversibly attaching handles 120, such as but not limited to, quick-release pins, detent pins, ball-lock pins, spring-lock pins, clevis pins (optionally used with a cotter pin or retaining clip), hitch pins, lynch pins, R-clips (hairpin cotters), split pins (cotter pins), threaded fasteners (e.g., bolts or screws used with nuts, lock nuts, or wing nuts), thumb screws, hand knobs with threaded studs, cam-lock levers, over-center toggle latches, spring-loaded locking plungers, bayonet-style twist locks, and slide-and-lock dovetail or tongue-and-groove couplers with a set screw or latch) and may be attached to axle 250.

[0065] Axle 250 may be similar to axle 150 shown in FIGS. 1A, 1B, and 1C. As described above, axle 250 may include axle extensions 255 to allow weight plates 260a and 260b to be added to axle 250 to increase the weight of wheel system 200. In some examples, axle 250 may have a diameter of approximately 1 inch (approximately 25 millimeters) or approximately 2 inches (approximately 50.6 millimeters) such that a standard or Olympic sized weight plate may be slid onto axle extensions 255. The weight plates may be secured on axle extensions 255 with collars or clamps.

[0066] Weight plates 260a and 260b may be a generally disk-shaped exercise weight configured for use with a barbell or other equipment having a standard or Olympic-sized sleeve. Weight plates 260a and 260b may include a central aperture having a nominal diameter corresponding to the diameter of axle extension 255, such that weight plates 260a and 260b may be slid onto axle extension 255. In some examples, weight plates 260a and 260b may be rigid and may be formed of cast iron, steel, or other dense material, and in some examples may include a protective or noise-reducing covering such as rubber, urethane, or another polymeric coating. In other examples, weight plates 260a and 260b may be deformable to provide a dynamic mass to further test a user's ability to maintain stability during movement.

[0067] In some examples, weight plates 260a and 260b may be hollow and may be filled with a particulate material, including, but not limited to, sand, metals (including, but not limited to, iron and lead), metal shot, metal shavings, water, pebbles, beans, seeds, gravel, wood pellets, and various other liquids and granular materials (or combinations thereof). By filling the interior volume of weight plates 260a and 260b, weight plates 260a and 260b may contribute to the weight of system 200. The volume and mass of the particulate material may be reversibly adjusted by adding or subtracting particulate material from weight plates 260a and 260b. The movement of particulate material in weight plates 260a and 260b may create a dynamic internal mass. The dynamic internal resistance may shift during use, (e.g., when a user tries to move sled 100) to test a user's ability to maintain stability during movement. In some examples, weight plates 260a and 260b may include a fill port (not expressly shown) to allow the particulate material to be added to or removed from the interior volume of weight plates 260a and 260b. The fill port may have a threaded cap to allow a user to access the interior volume. In some examples, the cap may also include a seal, such as an O-ring, to prevent the particulate material from leaking from the interior volume. In other examples, the fill port may include a bayonet-style twist-lock cap, a quarter-turn cam-lock cap, a latch-retained cover (including an over-center latch), a hinged cover with a latch, a snap-fit plug, an interference-fit plug, a tapered plug, a press-in plug with an O-ring, a detent-retained plug, a plug retained by a cross-pin or cotter pin, a plug retained by a set screw, a captive plug (tethered to the wheel), a rotating shutter or slide gate, and a valve-type closure (e.g., a ball valve or check valve) for liquid fill embodiments.

[0068] Weight plates 260a and 260b may be marked with a nominal weight value (e.g., in pounds and / or kilograms) and may include grip apertures, spokes, or a contoured perimeter to facilitate handling. The outer diameter and thickness of weight plates 260a and 260b may vary depending on the nominal weight and design (e.g., standard plates, bumper plates), while maintaining compatibility with axle extension 255.

[0069] In some examples, the diameter of axle 250 may vary along the length of axle 250. For example, axle extensions 255 may have a diameter corresponding to the inner diameter of weight plates 260a and 260b while the portion of axle 250 proximate to wheel 240 may have a different diameter.

[0070] In some examples, axle extension 255 may have a non-circular shape such that weight plates 260a and 260b rotate in sync with wheel 240. For example axle extension 255 may have any suitable cross-sectional shape, such as but not limited to, an oval or elliptical cross-section; a polygonal cross-section such as triangular, square, rectangular, pentagonal, or hexagonal; a splined cross-section (external splines); a keyed cross-section (e.g., a round shaft with a keyway, a D-shaft, or a double-D shaft); and a lobed cross-section (e.g., multi-lobed profiles).

[0071] Wheel 240 may be similar to wheel 140 shown in FIGS. 1A, 1B, and 1C. Wheel 240 may be hollow, with an interior volume. The interior volume of wheel 240 may be filled with a particulate material, including, but not limited to, sand, metals (including, but not limited to, iron and lead), metal shot, metal shavings, water, pebbles, beans, seeds, gravel, wood pellets, and various other liquids and granular materials (or combinations thereof).

[0072] Wheel 240 may include fill port 270 to allow the particulate material to be added to or removed from the interior volume of wheel 240 to increase or decrease the weight of wheel 240. Fill port 270 may be any suitable opening and closure to allow fill port 270 to be open and closed. For example, fill port 270 may have a threaded cap to allow a user to access the interior volume. In some examples, the cap may also include a seal, such as an O-ring, to prevent the particulate material from leaking from the interior volume. In other examples, fill port 270 may include a bayonet-style twist-lock cap, a quarter-turn cam-lock cap, a latch-retained cover (including an over-center latch), a hinged cover with a latch, a snap-fit plug, an interference-fit plug, a tapered plug, a press-in plug with an O-ring, a detent-retained plug, a plug retained by a cross-pin or cotter pin, a plug retained by a set screw, a captive plug (tethered to the wheel), a rotating shutter or slide gate, and a valve-type closure (e.g., a ball valve or check valve) for liquid fill embodiments.

[0073] Sled 100 and wheel system 200 may be used for a variety of exercises. For example, sled 100 may be used for a sled push exercise where a user stands behind sled 100, grips handles 120 and pushes sled 100 forward to roll wheel 140 along a surface. The shifting of the particulate material in wheel 140 may shift, requiring the user to stabilize the user's core during the exercise. A user may also face away from sled 100, grip handles 120 and push sled 100.

[0074] As another example, sled 100 may be used for a wheelbarrow carry exercise where the user lifts handles 120 and walks forward, pushing sled 100. The inertial of wheel 140 may require the user to stabilize sled 100 during the exercise.

[0075] As an additional example, wheel system 200 may be used for an abdominal rollout exercise. The user may kneel or stand and grasp axle extensions 255 and push when 240 back and forth across the floor. In addition to the standard benefits of an abdominal rollout exercise, the use of wheel system 200 with dynamic inertial resistance may require the user to engage the user's core to compensate for the moving and shifting of the particulate material in the inner volume of wheel 240.

[0076] As a further example of the utilization of dynamic inertial resistance, sled 100 may be used for pulling exercises. For example, a user may grip handles 120 and pull sled 100 while the user walks backwards. Additionally, or alternatively, a user may couple a strap or rope attached to a belt worn by the user to an anchor ring 114 or anchor ring 152 on sled 100 and walk forward or backwards to drag sled 100 across the floor. The user may also pull sled 100 using ropes coupled to an anchor ring 114 or anchor ring 152 with the user's hands for an upper body exercise.

[0077] FIG. 3 illustrates a method performed for adjusting exercise load of a hollow wheel, according to examples of the present disclosure. Method 300 may be implemented using a fitness sled, such as sled 100 or wheel system 200 or any other system operable to implement method 300. Although examples have been described above, other variations and examples may be made from this disclosure without departing from the spirit and scope of these disclosed examples.

[0078] Method 300 may begin at block 310 where a fill port (e.g., fill port 170 or fill port 270) of a hollow wheel (e.g., wheel 140 or wheel 240) may be opened. The fill port may provide access to an interior volume of the hollow wheel, which may be configured to house particulate material.

[0079] At block 320, particulate material may be added or removed through the fill port to vary a mass within the interior volume. Particulate material may include, for example, sand, metals (including, but not limited to, iron and lead), metal shot, metal shavings, water, pebbles, beans, seeds, gravel, wood pellets, and various other liquids and granular materials (or combinations thereof). Adjusting the mass of the particulate material may alter dynamic inertial resistance of the hollow wheel.

[0080] At block 330, the fill port may be closed. Closing the fill port may inhibit leakage of particulate material from the interior volume during use. The fill port may include any suitable closure to allow the fill port to be open and closed. For example, the fill port may have a threaded cap to allow a user to access the interior volume. In some examples, the cap may also include a seal, such as an O-ring, to prevent the particulate material from leaking from the interior volume. In other examples, the fill port may include a bayonet-style twist-lock cap, a quarter-turn cam-lock cap, a latch-retained cover (including an over-center latch), a hinged cover with a latch, a snap-fit plug, an interference-fit plug, a tapered plug, a press-in plug with an O-ring, a detent-retained plug, a plug retained by a cross-pin or cotter pin, a plug retained by a set screw, a captive plug (tethered to the wheel), a rotating shutter or slide gate, and a valve-type closure (e.g., a ball valve or check valve) for liquid fill embodiments.

[0081] At block 340, one or more weight plates (e.g., weight plates 260a and 260b shown in FIG. 2) may be mounted or removed on portions of an axle (e.g., axle 150 or axle 250) passing through a center of the hollow wheel and extending beyond a width of the hollow wheel. The axle may be configured to receive standard or Olympic-sized weight plates, which may be secured using collars or clamps.

[0082] Although FIG. 3 discloses a particular number of operations related to method 300, method 300 may be executed with greater or fewer operations than those depicted in FIG. 3. In addition, although FIG. 3 discloses a certain order of operations to be taken with respect to method 300, the operations comprising method 300 may be completed in any suitable order.

[0083] FIGS. 4A, 4B, 4C, and 4D illustrate example exercises that can be performed using a weighted exercise sled or wheel, according to examples of the present disclosure. FIG. 4A illustrates an exercise performed using a weighted exercise sled. In exercise 400, a user may position behind the sled and may engage the handles (e.g., handles 120 shown in FIGS. 1A, 1B, and 1C) to push the weighted exercise sled along a surface while the wheel (e.g., wheel 140 shown in FIGS. 1A, 1B, and 1C) rolls. Because exercise 400 is performed without lifting shown the weighted exercise sled, a skid on the weighted exercise sled (e.g., skid 130 shown in FIGS. 1A, 1B, and 1C) may remain available to limit side-to-side tipping and to stabilize apparatus during initiation, deceleration, or interruption of motion.

[0084] FIG. 4B depicts exercise 410, in which the weighted exercise sled can be engaged in a carrying the weighted exercise sled in a wheelbarrow configuration. Exercise 410 can be performed by a user lifting the handles of the weighted exercise sled relative to a surface so that at least a portion of the frame (e.g., frame 110 shown in FIGS. 1A, 1B, and 1C) and skids of the weighted exercise sled are elevated while the hollow wheel remains in contact with the surface. The handles may transmit lifting and steering input from the user to the frame, and the frame may transfer load to the axle and the hollow wheel. As the hollow wheel rolls, the weighted exercise sled may be advanced in a forward direction in a manner similar to carrying the sled in a wheelbarrow configuration.

[0085] FIG. 4C illustrates moving the weighted exercise sled using a rope coupled to one or more anchor rings. In exercise 420, the weighted exercise sled may move along a surface while the hollow wheel rolls and while particulate material disposed within interior volume of the hollow wheel shifts to provide dynamic inertial resistance. Exercise 420 may be performed with rope coupled to an anchor ring (e.g., anchor ring 114 or 152 shown in FIGS. 1A, 1B, and 1C) so that pulling force applied by hands of the user may be transferred through the frame to the axle and the hollow wheel. In some examples, the rope may be coupled to one of anchor rings positioned on the frame. In other examples, the handles may include one or more anchor rings for connecting waist belts, ropes, or straps, such that the rope may be coupled on or near the handles. As the user pulls the rope, the weighted exercise sled may travel across the surface in a dragging or towing movement while the hollow wheel remains in rolling contact with the surface.

[0086] In some examples, exercise 420 may be performed while the user faces the weighted exercise sled and pulls rope with the user's hands for an upper body exercise. The user may step rearward while maintaining tension in the rope so that the weighted exercise sled moves toward the user. In other examples, the user may face away from the the weighted exercise sled and push against the ropes, stepping forward to pull the weighted exercise sled behind the user. The user may change hand position, body posture, pulling angle, or travel distance to vary loading characteristics of exercise 420 while maintaining rope coupled to the anchor ring.

[0087] FIG. 4D illustrates an abdominal rollout exercise according to examples of the present disclosure. Exercise 430 may depict the weighted exercise wheel (e.g., weighted exercise wheel 200 shown in FIG. 2) positioned on a surface and engaged by a user in an ab-roller configuration. Exercise 430 may be performed by a user kneeling or standing and grasping axle extensions or handles (e.g., axle extensions 255 or handles 220 shown in FIG. 2) on opposite sides of the hollowing wheel while the weighted exercise wheel along the surface. The axle and the axle extensions may allow the weighted exercise wheel to move freely along the surface.

[0088] Exercises 400, 410, 420, and 430 may provide dynamic inertial resistance because particulate material within internal volume of the hollow wheel may shift during rolling movement. As the hollow wheel rotates, shifting particulate material may alter a center of mass of rolling fitness apparatus and may increase stabilization demand on the user. Exercises 400, 410, 420, and 430 may engage upper body musculature, trunk musculature, and lower body musculature while user controls rope tension and movement of the weighted exercise sled.

[0089] Exercises 400, 410, 420, and 430 may be performed with different exercise load conditions. For example, particulate material may be added through a fill port (e.g., fill port 170 shown in FIGS. 1A, 1B, and 1C) or removed through the fill port to vary mass within internal volume of the hollow wheel, and one or more weight plates may be mounted on portions of an axle (e.g., axle 150 shown in FIGS. 1A, 1B, and 1C) extending beyond a width of the hollow wheel. These adjustments may allow exercises 400, 410, 420, and 430 to be adapted for different users, training intensities, and workout progressions while maintaining a pushing movement pattern using the weighted exercise sled.

[0090] Although examples have been described above, other variations and examples may be made from this disclosure without departing from the spirit and scope of these disclosed examples. The scope of the described subject matter encompasses variations, modifications, and alternative arrangements that align with the principles disclosed.

[0091] Certain well-understood details, such as standard manufacturing techniques, material properties, or common fitness equipment features, may be omitted for clarity and brevity. It is to be understood that the described subject matter is adaptable to various implementations, including changes in dimensions, materials, or component arrangements, without departing from the intended purpose. The examples provided herein are illustrative and are not to be construed as all-encompassing or restrictive, as the described subject matter allows for numerous adaptations within the scope of the claims.

Examples

Embodiment Construction

[0031]According to an aspect of the disclosure, a multifunctional exercise sled with an oblate spheroid wheel and dynamic inertial resistance is provided. Conventional fitness equipment often lacks versatility and adaptability, requiring users to rely on multiple pieces of equipment to achieve a comprehensive workout. These limitations can result in inefficient training, increased equipment clutter, and restricted exercise variety. The present disclosure may provide a multifunctional exercise sled featuring an oblate spheroid wheel with dynamic inertial resistance. By enabling a range of exercise modalities within a single apparatus and allowing for adjustable resistance, the present disclosure may offer enhanced training flexibility, improved user engagement, and more efficient use of space and resources.

[0032]The weighted exercise sled may be used for a variety of exercises, such as exercises typically performed using a sled, wheelbarrow, ab-roller, or any combination thereof. The...

Claims

1. An apparatus, comprising:a hollow wheel having an internal volume, the hollow wheel to house a particulate material in the internal volume;an axle passing through the center of the hollow wheel;a frame coupled to the axle;a handle coupled to an end of the frame opposite the axle; anda skid coupled to the frame to support the handle.

2. The apparatus of claim 1, wherein the hollow wheel has an oblate spheroid shape.

3. The apparatus of claim 1, comprising a fill port in the hollow wheel to allow the particulate material to be added to or removed from the internal volume.

4. The apparatus of claim 3, wherein the fill port comprises:a threaded cap; anda seal to prevent leakage of the particulate material from the internal volume.

5. The apparatus of claim 1, comprising an anchor ring coupled to the frame.

6. The apparatus of claim 1, wherein the axle extends beyond a width of the hollow wheel to receive and secure weight plates.

7. The apparatus of claim 1, wherein the hollow wheel includes a raised tread pattern on an external surface of the hollow wheel.

8. The apparatus of claim 1, wherein the hollow wheel includes an internal rib to reinforce a wall of the hollow wheel.

9. The apparatus of claim 1, wherein the handle is removably coupled to the frame via a quick-release pin.

10. The apparatus of claim 1, wherein the skid is rotatable relative to the frame to enable vertical storage of the apparatus.

11. The apparatus of claim 10, wherein the handle is lockable in an upright position to enable vertical storage of the apparatus.

12. An apparatus, comprising:a hollow wheel having an internal volume, the hollow wheel to house a particulate material in the internal volume; andan axle passing through the center of the hollow wheel, the axle extending beyond a width of the hollow wheel to form a first hand grip on a first side of the hollow wheel and a second hand grip on a second side of the hollow wheel.

13. The apparatus of claim 12, wherein the hollow wheel has an oblate spheroid shape.

14. The apparatus of claim 12, comprising a fill port in the hollow wheel to allow the particulate material to be added to or removed from the internal volume;wherein the fill port comprises:a threaded cap; anda seal to prevent leakage of the particulate material from the internal volume.

15. The apparatus of claim 12, wherein portions of the axle extending beyond the width of the hollow wheel are to receive and secure weight plates.

16. The apparatus of claim 12, wherein the hollow wheel includes a raised tread pattern on an external surface of the hollow wheel.

17. The apparatus of claim 12, wherein the hollow wheel includes an internal rib to reinforce a wall of the hollow wheel.

18. A method of exercising, comprising:performing an exercise using a rolling fitness apparatus, the rolling fitness apparatus comprising:a hollow wheel defining an interior volume; anda particulate material disposed within the interior volume;wherein the exercise includes rolling the hollow wheel along a surface; andwherein the particulate material shifts within the interior volume during the exercise to provide dynamic inertial resistance.

19. The method of claim 18, further comprising:adjusting an exercise load of the rolling fitness apparatus by at least one of:adding the particulate material through a fill port in the hollow wheel;removing the particulate material through the fill port;mounting at least one weight plate on a portion of an axle passing through a center of the hollow wheel and extending beyond a width of the hollow wheel; orremoving at least one weight plate on the portion of the axle passing through the center of the hollow wheel and extending beyond the width of the hollow wheel.

20. The method of claim 18, wherein the exercise includes at least one of:pushing a sled including the hollow wheel along the surface;carrying the sled in a wheelbarrow configuration;moving the sled using a rope coupled to an anchor ring; orperforming an abdominal rollout by grasping one or more axle portions extending beyond a width of the hollow wheel.

Images