Exercise system simulating stand-up paddleboarding

Abstract

An exercise system for simulating stand-up paddleboarding includes a rail extending parallel to a longitudinal axis, a resistance system attached to the rail toward the forward end, a platform attached to the rail toward the aft end for supporting a person standing thereon, an elongate shaft configured to be handled by the person standing on the platform in a manner simulating rowing with a paddle, a line guide attached to the rail between the resistance system and the platform, and a tensioning line attached to the resistance system and extending through the line guide to a second end secured to the elongate shaft, where a forward length of the tensioning line extends from the resistance system to the line guide and is substantially parallel to the longitudinal axis.

Description

Attorney Docket: 300318-401039 (2024-086)EXERCISE SYSTEM SIMULATING STAND-UP PADDLEBOARDINGTECHNICAL FIELD

[0001] This disclosure relates in general to the field of exercise equipment, and more particularly, but not by way of limitation, to a kit for retrofitting conventional rowing machines for simulating stand-up paddleboard and exercise apparatus for simulating stand-up paddleboarding.BACKGROUND

[0002] This section provides background information to facilitate a better understanding of the various aspects of the disclosure and is not an admission of prior art.

[0003] Aging, chronic disease, and neurologic or orthopedic injuries compromise balance and sensory function. Load bearing exercise while standing can improve balance and reduce the risk of falling. Depending on the intensity and duration, it may also improve metabolic and cardiovascular function. Rowing ergometers have been used as an exercise training tool since the mid- 1800s and are now a widely popular form of exercise. These machines are often available in commercial gyms or for purchase for in-home use. Although rowing is a strong metabolic stimulus, it does not improve balance because the user rows in a seated position and does not bear load through the skeleton in standing. Moreover, rowing can become boring when completing for extended periods or repeated over multiple weeks, months, etc.

[0004] Stand-up paddleboarding is an exceptional exercise involving arms, back, abdomen, and legs to maintain balance. Paddleboards are generally ten to eighteen feet in length and can be expensive. This disclosure teaches various exercise systems and methods to simulate stand-up paddleboarding.14931-7122-4444.1Attorney Docket: 300318-401039 (2024-086)SUMMARY

[0005] An illustrative exercise system for simulating stand-up paddleboarding includes a rail extending parallel to a longitudinal axis from a forward end to an aft end, a resistance system attached to the rail toward the forward end, a platform attached to the rail for supporting a person standing thereon, an elongate shaft configured to be handled by the person standing on the platform in a manner simulating rowing with a paddle, a line guide attached to the rail between the resistance system and the platform, and a tensioning line attached at a first end to the resistance system and extending through the line guide to a second end secured to the elongate shaft, wherein a forward length of the tensioning line extends from the resistance system to the line guide and is substantially parallel to the longitudinal axis, and an aft length of the tensioning line extends from the line guide to the second end.

[0006] The platform may pivot about longitudinal axis and a transverse axis. The platform may include a right platform and a left platform separated along the centerline of the exercise system, where the left platform and the right platform pivot independent of one another.

[0007] An illustrative method for exercising includes a person simulating stand-up paddleboarding on an exercise system including a rail extending parallel to a longitudinal axis X from a forward end to an aft end, a resistance system attached to the rail toward the forward end, a platform mounted with the rail, an elongate shaft configured to simulate a paddle, a line guide attached to the rail between the resistance system and the platform, and a tensioning line attached at a first end to the resistance system and extending through the line guide to a second end secured to the elongate shaft, wherein a forward length of the tensioning line extends from the resistance system to the line guide and is substantially parallel to the longitudinal axis X, and an aft length of the24931-7122-4444.1Attorney Docket: 300318-401039 (2024-086) tensioning line extends from the line guide to the second end. The person stands on the platform and simulates stand-up rowing with the elongated shaft and the platform pivots in response to downward force from the person standing thereon.

[0008] An illustrative kit for retrofitting a rowing machine for simulating stand-up paddleboarding includes a platform configured to attach to central horizontal rail of rowing machine in place of the rowing machine seat, a line guide to attach to the rowing machine between the resistance system and the platform to maintain a tensioning line in a straight line between the resistance system and the line guide, and an elongate shaft configured to be attached to the tensioning line and to be handled by the person standing on the platform in a manner simulating rowing with a paddle.

[0009] This summary is provided to introduce a selection of concepts that are further described below in the detailed description. This summary is not intended to identify key or essential features of the claimed subject matter, noris it intended to be used as an aid in limiting the scope of claimed subject matter.34931-7122-4444.1Attorney Docket: 300318-401039 (2024-086)BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The disclosure is best understood from the following detailed description when read with the accompanying figures. It is emphasized that, in accordance with standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of various features may be arbitrarily increased or reduced for clarity of discussion. As will be understood by those skilled in the art with the benefit of this disclosure, elements and arrangements of the various figures can be used together and in configurations not specifically illustrated without departing from the scope of this disclosure.

[0011] Figure 1 is a perspective view of an illustrative exercise system for simulating stand-up paddleboarding according to one or more aspects of the disclosure.

[0012] Figure 2 is another perspective view of an illustrative exercise system for simulating standup paddleboarding according to one or more aspects of the disclosure.

[0013] Figure 3 illustrates an example load cell with tension line connectors for connecting in the tension line according to one or more aspects of the disclosure.

[0014] Figure 4 is a schematic diagram of orientation of force vectors with a line guide according to one or more aspects of the disclosure.

[0015] Figure 5 is a perspective view of an illustrative line guide according to one or more aspects of the disclosure.

[0016] Figure 6 is another perspective view of an illustrative line guide according to one or more aspects of the disclosure.44931-7122-4444.1Attorney Docket: 300318-401039 (2024-086)

[0017] Figure 7 is a perspective view of an illustrative paddleboard platform according to one or more aspects of the disclosure.

[0018] Figure 8 is a perspective view of another illustrative paddleboard platform according to one or more aspects of the disclosure.

[0019] Figure 9 is another perspective view of the illustrative paddleboard platform of FIG. 8 according to one or more aspects of the disclosure.

[0020] Figure 10 is a perspective view of an illustrative paddleboard platform with pivoting platform sections with a stable outer housing according to one or more aspects of the disclosure.

[0021] Figure 11 illustrates a person simulating stand-up paddleboarding on an exercise system according to one or more aspects of the disclosure.54931-7122-4444.1Attorney Docket: 300318-401039 (2024-086)DETAILED DESCRIPTION

[0022] It is to be understood that the following disclosure provides many different embodiments, or examples, for implementing different features of various illustrative embodiments. Specific examples of components and arrangements are described below to simplify the disclosure. These are, of course, merely examples and are not intended to be limiting. For example, a figure may illustrate an exemplary embodiment with multiple features or combinations of features that are not required in one or more other embodiments and thus a figure may disclose one or more embodiments that have fewer features or a different combination of features than the illustrated embodiment. Embodiments may include some, but not all the features illustrated in a figure and some embodiments may combine features illustrated in one figure with features illustrated in another figure. Therefore, combinations of features disclosed in the following detailed description may not be necessary to practice the teachings in the broadest sense and are instead merely to describe particularly representative examples. In addition, the disclosure may repeat reference numerals and / or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not itself dictate a relationship between the various embodiments and / or configurations discussed.

[0023] Figure 1 depicts three mutually orthogonal directions X, Y, and Z forming a three- dimensional frame of reference. A longitudinal axis X extends horizontally and along a forward and aft centerline of the exercise system, a transverse axis Y is transverse to longitudinal axis X, and a vertical axis Z, where the X-Y plane is considered horizontal, andtheX-Z plane is considered vertical.64931-7122-4444.1Attorney Docket: 300318-401039 (2024-086)

[0024] FIGS. 1 and 2 depict an illustrative exercise system, generally designated by the numeral 10, for simulating stand-up paddleboarding. The exercise system can be provided as an intact exercise assembly or provided as a kit for retrofitting a conventional rowing machine as will be understood with reference to this disclosure. Exercise system 10 includes a rail 12 extending parallel to longitudinal axis X from a forward end 14 to an aft end 16. Rail 12 may be supported above the ground with legs 18. In the illustrated example, rail 12 includes a forward rail section 12F and an aft rail section 12A. Aft rail section 12A is extends horizontally and forward rail section 12F extends vertically from aft rail section 12A at an acute angle to the horizontal plane. In some embodiments, rail 12 may be a linear extending member. The longitudinal axis X is used to describe the centerline of the exercise system and in the illustrated embodiments is coaxial with horizontal aft rail 12A.

[0025] A resistance system 20 is attached to rail 12 toward, or proximate to, forward end 14. Resistance systems 20 can take various forms and is illustrated in a vertical flywheel arrangement that may use for example one or more of air, magnets, water, and dampers to provide resistance and a recoil mechanism to retract the tensioning line.

[0026] A platform 22, for supporting a person standing thereon, is attached to rail 12 toward the aft end and on a horizontal portion of the rail. Platform 22 may be stationary relative to rail. In some embodiments platform 22 pivots at least left and right relative to the central axis of the machine. According to aspects of the disclosure, platform 22 includes a left platform 22L and a right platform 22R each of which are positioned above aft rail 12A and separated by the central, longitudinal axis X. In this example, left platform 22L and right platform 22R can pivot independent of each other in response to downward force from the person standing on the platform.74931-7122-4444.1Attorney Docket: 300318-401039 (2024-086)This pivoting movement can be forward and aft about the transverse axis Y and left and right relative to longitudinal axis X simulating paddleboarding on water. In some embodiments, platform 22 may include sensors to measure various data that can be displayed in real time and / or stored.

[0027] An elongate shaft 24 configured to be handled by the person standing on the platform in a manner simulating rowing with a paddle is provided. Elongate shaft 24 may be an actual paddle or simulate a paddle. In some embodiments, elongate shaft 24 may include sensors 82 (FIG. 11) such as accelerometers.

[0028] A line guide 26 is attached to rail 12 between resistance system 20 and platform 22. In systems with a non-linear rail 12, line guide 26 is attached along the non-horizontal forward rail 12F.

[0029] A tensioning line 28 is attached at a first end 30 to resistance system 20 and extends through line guide 26 to a second end 32 secured to elongate shaft 24. A forward length 28F of tensioning line 28 extends from the resistance system to the line guide and i s maintained substantially parallel to the longitudinal axis X, and an aft length 28A of the tensioning line extends from the line guide to the second end. Tensioning line 28 may be a single length of material or two or more interconnect sections of the same or different structures. For example, and without limitation, forward length 28F may include a chain or belt connected at one end to resistance system 20 and connected on the other end to a rope or cable. In some embodiments a load cell 34 is connected in forward length 28F to measure kinetic data during simulated paddleboarding and the load cell may communicate the measured data to storage and / or to a display for real time monitoring. Load cell 34 may be used to interconnect tensioning line sections in forward length 28F.84931-7122-4444.1Attorney Docket: 300318-401039 (2024-086)

[0030] Referringto FIG. 2, platform 22 is shown positioned above rail 12. Platform 22 includes a subframe 36 that is rigidly attached to rail 12 and extends on the left and the right side of the rail. Subframe 36 may be permanently or temporarily attached to the rail and rigidly attached to minimize movement of the subframe. A left set 38 of biasing mechanisms 40, e.g., springs, is positioned between and in contact with subframe 36 and left platform 22L to permit left platform 22L to pivot. Similarly, a right set 42 of biasing mechanisms 40 is positioned between and in contact with subframe 36 and right platform 22R.

[0031] FIG 3 illustrates an exemplary load cell 34 for connecting in forward tensioning line length 28F. In this example, load cell 34 is configured to interconnect tensioning line formed of different materials. A first forward tensioning line 28F’ is identified as a chain and attaches to the load cell 34 via a clevis 44. A second forward tensioning line 28F” in the form of a rope is attached to the load cell via a rope connector 46, which may include for example a nut with a side hole for tying the rope to the connector. In this example, load cell 34 includes an additional sensor 48 such as an accelerometer.

[0032] FIG. 4 schematically illustrates tensioning line 28 and line guide 26. Line guide 26 maintains forward tensioning line length 28F in a linear position, a linear resistance vector, between resistance system 20 (e.g., flywheel) and line guide 26. Line guide 26 may include a swivel mechanism 50 at an aft outlet 52 that allows the user to move the paddle, and thus aft tensioning line 28A, off axis from forward tension line length 28F.

[0033] FIGS. 5 and 6 illustrate aspects of an example line guide 26. Line guide 26 is configured to be mounted on a forward rail section that is at an inclinedangle to the horizontal aft rail section, however, aspects of the line guide apply to a single horizontal rail. Line guide 26 includes a first94931-7122-4444.1Attorney Docket: 300318-401039 (2024-086) duct 54 with a forward inlet 56 into which forward tensioning line length 28F enters. First duct 54 has an aft outlet 52 from which aft tensioning line length 28A extends. Aft outlet 52 may have a funnel shape and / or a swivel connection 50 allowing aft tensioning line length 28A to move off- axis from forward tensioning line length 28F and minimizing wear on the tensioning line. For example, aft outlet 52 includes a ring of ball bearings 58 to guide aft tensioning line length 28A at any angle. Duct 54 may be linear or have one or more turns to position the tensioning line for the exercise system configuration.

[0034] FIG. 7 illustrates an example paddleboard platform 22 that does not include sensors. Subframe 36 is rigidly attached to rail 12. Platform 22 includes a left platform 22L and a right platform 22R separated along the centerline of the exercise device. Left platform 22L and right platform 22Rcan pivot independent of each other. Platforms 22L and 22R are moveably supported by biasing mechanisms 40 as shown between subframe 36 and right platform 22R.

[0035] FIGS. 8 and 9 illustrate an example paddleboard platform 22 that includes sensors 60, such as load cells and accelerometers. Each platform 22L, 22R includes a top plate 62 and a bottom plate 64 that are stacked and separated by sensors 60 sandwiched between the top and bottom plate.

[0036] FIGS. 8 and 9 also illustrate aspects of an illustrative subframe 36. Subframe 36 includes a planar portion on the left side and the right side of the rail 12 and a central channel 66 that disposes rail 12. Subframe 36 may be secured with a clamp 68 between rail 12 and channel 66. A bracket 70 may be positioned below rail 12 and subframe 36 and be secured to subframe 36, for example by bolts 72, to increase the stability and rigid attachment placement of subframe 36 to rail 12.104931-7122-4444.1Attorney Docket: 300318-401039 (2024-086)

[0037] FIG. 10 illustrates an example paddleboard platform 22 in isolation. In this example, platform 22 includes left and right platforms 22L, 22R configured to pivot independent from each other and the platform may include sensors. Left and right platforms 22L, 22R are encircled by a housing 74 that does not move with right and left platforms 22L, 22R. Housing 74 can provide a stable surface for the user to mount and dismount as well as protect the user from being pinched by moving elements.

[0038] FIG. 11 schematically illustrates a method of use of exercise system 10, which is described with reference to FIGS. 1-10. A person 76 stands on platform 22 with a left foot 78 on the left platform 22L and the right foot 80 on the right platform 22R. Tension line 28 extends from resistance system 20 and is attached to elongate shaft 24. Elongate shaft 24 may have one or more sensors 82, such as accelerometers. Person 76 simulates the stand-up rowing action with elongate shaft 24. When person 76 shifts weight a downward force is applied and the left and right platforms pivot independent of each other. Exercise system 10 may include an electronic processor 84 with memory and software to receive data from various sensors, such as load cells and accelerometers. The measured data may be displayed on a monitor 86 in real time and / or at a later time on a remote monitor.

[0039] Although relative terms such as “outer,” “inner,” “upper,” “lower,” and similar terms have been used herein to describe a spatial relationship of one element to another, it is understood that these terms are intended to encompass different orientations of the various elements and components in addition to the orientation depicted in the figures. Furthermore, as used herein, the terms “connect,” “connection,” “connected,” “in connection with,” and “connecting” may be used to mean in direct connection with or in connection with via one or more elements. Similarly, the114931-7122-4444.1Attorney Docket: 300318-401039 (2024-086) terms “couple,” “coupling,” and “coupled” may be used to mean directly coupled or coupled via one or more elements. The terms “substantially,” “approximately,” “generally,” and “about” are defined as largely butnot necessarily wholly what is specified (and includes what is specified; e.g., substantially 90 degrees includes 90 degrees and substantially parallel includes parallel), as understood by a person of ordinary skill in the art. The extent to which the description may vary will depend on how great a change can be instituted and still have a person of ordinary skill in the art recognized the modified feature as still having the required characteristics and capabilities of the unmodified feature.

[0040] The foregoing outlines features of several embodiments so that those skilled in the art may better understand the aspects of the disclosure. Those skilled in the art should appreciate that they may readily use the disclosure as a basis for designing or modifying other processes and structures for carrying out the same purposes and / or achieving the same advantages of the embodiments introduced herein. Those skilled in the art should also realize that such equivalent constructions do not depart from the spirit and scope of the disclosure and that they may make various changes, substitutions, and alterations herein without departing from the spirit and scope of the disclosure. The scope of the invention should be determined only by the language of the claims that follow. The term “comprising” within the claims is intended to mean “including at least” such that the recited listing of elements in a claim is an open group. The terms “a,” “an” and other singular terms are intended to include the plural forms thereof unless specifically excluded.124931-7122-4444.1

Claims

Attorney Docket: 300318-401039 (2024-086)WHAT IS CLAIMED IS:

1. An exercise system for simulating stand-up paddleboarding, the exercise system comprising: a rail extending parallel to a longitudinal axis X from a forward end to an aft end; a resistance system attached to the rail toward the forward end; a platform attached to the rail for supporting a person standing thereon; an elongate shaft configured to be handled by the person standing on the platform in a manner simulating rowing with a paddle; a line guide attached to the rail between the resistance system and the platform; and a tensioning line attached at a first end to the resistance system and extending through the line guide to a second end secured to the elongate shaft, wherein a forward length of the tensioning line extends from the resistance system to the line guide and is substantially parallel to the longitudinal axis X, and an aft length of the tensioning line extends from the line guide to the second end: wherein three mutually orthogonal directions form a three-dimensional frame of reference, with the longitudinal axis X extending horizontally and along a centerline of the exercise system, an axis Y transverse to the longitudinal axis X, and a vertical axis Z, where an X-Y plane is considered horizontal, and an X-Z plane is considered vertical.

2. The exercise system of claim 1, further comprising a load cell connected in the forward length to measure kinetic data and the load cell in communication with a monitor to visually display the kinetic data.

3. The exercise system of claim 1, wherein the platform comprises: a left platform and a right platform mounted side-by-side above the rail and separated by the longitudinal axis X, wherein the left platform and the right platform pivot independent of each other in response to downward force from the person standing thereon and the left platform and the right platform each pivot left and right relative to the longitudinal axis X and pivot forward and aft relative to the transverse axis Y.134931-7122-4444.1Attorney Docket: 300318-401039 (2024-086)4. The exercise system of claim 1, wherein the platform comprises: a subframe rigidly attached to the rail and extending on the left side of the rail and the right side of the rail; a left platform and a right platform separated by the longitudinal axis X; a left set of biasing mechanisms positioned between the subframe and the left platform positioning the left platform above the rail and allowing the left platform to pivot left and right relative to the longitudinal axis X and pivot forward and aft relative to the transverse axis Y in response to downward force from the person standing on the platform; and a right set of biasing mechanisms positioned between the subframe and the right platform positioning the right platform above the rail and allowing the right platform to pivot left and right relative to the longitudinal axis X and pivot forward and aft relative to the transverse axis Y in response to downward force from the person standing on the platform.

5. The exercise system of claim 4, wherein the left platform includes a left load cell to measure to measure the downward force from the person on the left platform; and the right platform includes a right load cell to measure the downward force from the person on the right platform.

6. The exercise system of claim 1, wherein the line guide comprises: a first duct maintaining the forward length of the tensioning line substantially parallel to the longitudinal axis X; and the first duct having an aft outlet allowing the aft length of the tensioning line to extend at any angle relative to the longitudinal axis X with movement of the elongate shaft simulating rowing.

7. The exercise system of claim 6, wherein the platform comprises: a subframe rigidly attached to the rail and extending on the left side of the rail and the right side of the rail; a left platform and a right platform separated by the longitudinal axis X; a left set of biasing mechanisms positioned between the subframe and the left platform positioning the left platform above the rail and allowing the left platform to pivot left and right144931-7122-4444.1Attorney Docket: 300318-401039 (2024-086) relative to the longitudinal axis X and pivot forward and aft relative to the transverse axis Y in response to downward force from the person standing on the platform; and a right set of biasing mechanisms positioned between the subframe and the right platform positioning the right platform above the rail and allowing the right platform to pivot left and right relative to the longitudinal axis X and pivot forward and aft relative to the transverse axis Y in response to downward force from the person standing on the platform.

8. The exercise system of claim 7, wherein the left platform includes a left load cell to measure to measure the downward force from the person on the left platform; and the right platform includes a right load cell to measure the downward force from the person on the right platform.

9. The exercise system of claim 1, wherein: the rail comprises a forward rail section extending vertically at an acute angle to the horizontal plane and an aft rail section parallel to the horizontal plane; the resistance system and the line guide are attached to the forward rail section; the platform is attached to the aft rail section; and the line guide comprises: a first duct having a forward inlet maintaining the forward length of the tensioning line substantially parallel to the forward rail section; an aft outlet allowing the aft length of the tensioning line to extend at any angle relative to the longitudinal axis X with movement of the elongate shaft simulating rowing; and the first duct redirecting the tensioning line from parallel to the forward rail at the forward inlet to parallel to the aft rail section at the aft outlet.

10. The exercise system of claim 9, wherein the platform comprises: a subframe rigidly attached to the rail and extending on the left side of the rail and the right side of the rail; a left platform and a right platform separated by the longitudinal axis X; a left set of biasing mechanisms positioned between the subframe and the left platform positioning the left platform above the rail and allowing the left platform to pivot left and right154931-7122-4444.1Attorney Docket: 300318-401039 (2024-086) relative to the longitudinal axis X and pivot forward and aft relative to the transverse axis Y in response to downward force from the person standing on the platform; and a right set of biasing mechanisms positioned between the subframe and the right platform positioning the right platform above the rail and allowing the right platform to pivot left and right relative to the longitudinal axis X and pivot forward and aft relative to the transverse axis Y in response to downward force from the person standing on the platform.

11. The exercise system of claim 10, wherein the left platform includes a left load cell to measure to measure the downward force from the person on the left platform; and the right platform includes a right load cell to measure the downward force from the person on the right platform.

12. A method for exercising according to claim 1, the method comprising: a person standing on the platform and simulating stand-up rowing with the elongated shaft; and the platform pivoting in response to downward force from the person standing thereon and simulating stand-up rowing.

13. The method of claim 12, wherein: the rail comprises a forward rail section extending vertically at an acute angle to the horizontal plane and an aft rail section parallel to the horizontal plane; the resistance system and the line guide are attached to the forward rail section; the platform is attached to the aft rail section; and the line guide comprises: a first duct having a forward inlet maintaining the forward length of the tensioning line substantially parallel to the forward rail section; an aft outlet allowing the aft length of the tensioning line to extend at any angle relative to the longitudinal axis X with movement of the elongate shaft simulating rowing; and the first duct redirecting the tensioning line from parallel to the forward rail at the forward inlet to parallel to the aft rail section at the aft outlet.164931-7122-4444.1Attorney Docket: 300318-401039 (2024-086)14. The method of claim 12, wherein: the platform comprises a left platform and a right platform mounted side-by-side above the rail and separated by the longitudinal axis X, wherein the left platform and the right platform pivot independent of each other and the left platform and the right platform each pivot left and right relative to the longitudinal axis X and pivot forward and aft relative to the transverse axis Y; and positioning a left foot of the person on the left platform and a right foot of person on the right platform.

15. The method of claim 14, wherein the platform comprises: a subframe rigidly attached to the rail and extending on the left side of the rail and the right side of the rail; a left set of biasing mechanisms positioned between the subframe and the left platform positioning the left platform above the rail and allowing the left platform to pivot left and right relative to the longitudinal axis X and pivot forward and aft relative to the transverse axis Y in response to downward force from the person standing on the platform; and a right set of biasing mechanisms positionedbetween the subframe and the right platform positioning the right platform above the rail and allowing the right platform to pivot left and right relative to the longitudinal axis X and pivot forward and aft relative to the transverse axis Y in response to downward force from the person standing on the platform.

16. The method of claim 15, wherein the left platform includes a left load cell to measure to measure the downward force from the person on the left platform; and the right platform includes a right load cell to measure the downward force from the person on the right platform.

17. The method of claim 12, wherein: the rail comprises a forward rail section extending vertically at an acute angle to the horizontal plane and an aft rail section parallel to the horizontal plane; the resistance system and the line guide are attached to the forward rail section; the platform is attached to the aft rail section;174931-7122-4444.1Attorney Docket: 300318-401039 (2024-086) the line guide comprises: a first duct having a forward inlet maintaining the forward length of the tensioning line substantially parallel to the forward rail section; an aft outlet allowing the aft length of the tensioning line to extend at any angle relative to the longitudinal axis X with movement of the elongate shaft simulating rowing; and the first duct redirecting the tensioning line from parallel to the forward rail at the forward inlet to parallel to the aft rail section at the aft outlet; and the platform comprises: a subframe rigidly attached to the rail and extending on the left side of the rail and the right side of the rail; a left set of biasing mechanisms positioned between the subframe and the left platform positioning the left platform above the rail and allowing the left platform to pivot left and right relative to the longitudinal axis X and pivot forward and aft relative to the transverse axis Y in response to downward force from the person standing on the platform; and a right set of biasing mechanisms positionedbetween the subframe and the right platform positioning the right platform above the rail and allowing the right platform to pivot left and right relative to the longitudinal axis X and pivot forward and aft relative to the transverse axis Y in response to downward force from the person standing on the platform.184931-7122-4444.1

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