A single door insert piece prone type of back leg press exercise machine

Abstract

The utility model discloses a kind of single door insert piece prone formula rear leg training equipment, belong to fitness equipment technical field. Including integrated chassis, prone support assembly, insert piece counterweight unit, rear leg stress unit and transmission unit, the prone support assembly is fixed in integrated chassis front end side portion, the prone support assembly includes support platform, and arm and chest support unit are provided in the support platform upper portion;Integrated chassis is fixed with knee pad unit at the rear of arm and chest support unit;Integrated chassis is fixed with insert piece counterweight unit on opposite side of prone support assembly;The rear leg stress unit includes swing platform and the support body of close setting in the front end of insert piece counterweight unit, the single door insert piece prone formula rear leg training equipment of the utility model, adopt single side single door insert piece counterweight to match sliding type rear leg structure, while compressing the volume of complete machine, improve human adaptability and training power feeling, accurately strengthen hip and leg muscle group.

Description

Technical Field

[0001] This utility model specifically relates to a single-door insert prone leg kick training device, belonging to the field of fitness equipment technology. Background Technology

[0002] The prone leg press machine is mainly used to specifically train the hip extensor muscles such as the gluteus maximus and hamstrings, and is one of the core pieces of equipment for glute and leg training in gyms. For example, Chinese Patent Publication No. CN118892640A discloses a force measurement and correction device and its usage method for fitness planning, including a prone support frame, a leg press machine, a force measurement mechanism, and a correction and positioning mechanism. The leg press machine is mounted on the prone support frame, and the force measurement mechanism and correction and positioning mechanism are located on the side of the leg press machine. Existing similar devices mainly have the following drawbacks: 1. The plate-type structure requires manual addition and removal of barbell plates, making weight adjustment cumbersome, and the exposed weights pose safety hazards such as collisions and hand pinching; the dual-column plate weight structure is bulky and has a large overall width, taking up too much space in the gym. 2. Most swing-arm pedal machines have an arc motion trajectory, which has a low degree of conformity with the straight force path of human hip joint extension, resulting in poor muscle stimulation efficiency; moreover, the angle adjustment mechanism is complicated and it is difficult to quickly adapt to users of different heights and leg lengths, which can easily lead to the problem of lumbar compensation. 3. Some single-leg training machines require trainees to frequently adjust their body posture and support position, resulting in low training efficiency and insufficient stability of the support structure, making them prone to shifting during heavy weight training. Utility Model Content

[0003] To address the aforementioned issues, this invention proposes a single-door insert prone leg kick training device. It employs a single-side single-door insert weighted design combined with a sliding leg kick structure, which reduces the overall size of the machine while improving human adaptability and training feel, and precisely strengthens the glutes and hamstrings.

[0004] This utility model relates to a single-door, plate-inserted, prone leg-kicking training device, comprising: Integrated base frame; A prone support assembly is fixed to the front side of an integrated base frame. The prone support assembly includes a support platform, and an arm and chest support unit is provided above the support platform. A knee pad unit is fixed to the rear of the arm and chest support unit on the integrated base frame. The integrated base frame has a counterweight unit fixed on the opposite side of the prone support assembly. The counterweight unit is a single-door closed cabinet structure with multiple counterweight blocks stacked vertically inside. Different combinations of counterweight blocks can be selected through pins to adjust the training resistance. The fully enclosed design of the counterweight enhances the safety of use, and the overall structure is compact and occupies little space. The rear pedal force-bearing unit includes a swing platform and a support body located close to the front end of the insert counterweight unit. A hinge seat is fixed to the top of the support body, and a pin seat is fixed to the lower part of the top surface of the swing platform. The hinge seat and the pin seat are hinged together by a hinge shaft. A telescopic rod is hinged to the front end of the support body and the bottom surface of the swing platform of the integrated base frame. A locking knob is screwed onto the telescopic rod, and damping rods are fixed to the telescopic end and the fixed end of the telescopic rod. A disc seat is slidably arranged on the swing platform, and a rear pedal force-bearing seat is fixed to the front end face of the disc seat. The transmission unit includes a pull seat fixed to the back of the disc base, a pull lug hinged to the pull seat, a first transition guide wheel rotatably disposed on the back of the hinge seat, and a second transition guide wheel fixed below the first transition guide wheel on the integrated base frame; a steel wire rope is fixed to the pull lug, and the steel wire rope passes around the first transition guide wheel and the second transition guide wheel respectively and is connected to the lifting end of the insert counterweight unit.

[0005] During training, adjust the sliding path of the push-off support seat according to the trainee's height by loosening the locking knob. Then, push or pull the swing platform up or down to rotate it along the telescopic rod and hinge seat, adjusting the tilt angle. After adjustment, lock the telescopic rod length using the locking knob. Next, insert the pin into a weight socket according to the trainee's strength training needs. After completing the pre-training adjustments, the prone push-off can begin. The trainee lies prone on top of the prone support assembly, supported by the arm and chest support units. The knee pads support the knees. Then, the trainee performs the push-off exercise. During the exercise, the left foot or right leg... When the foot touches the back pedal bearing seat, it pushes the back pedal bearing seat to slide backward and upward in a straight line. When the back pedal bearing seat is pushed, the disc seat and the pull seat are pushed synchronously, thus pushing the pull lug on the pull seat synchronously. At this time, the pull lug pulls the steel cable. The steel cable is guided by the first transition guide wheel, the second transition guide wheel and the guide wheel inside the insert counterweight unit, and pulls the lifting end of the insert counterweight unit straight upward. The counterweight of the insert counterweight unit provides resistance for the back pedal operation. After the leg completes the back pedal operation, the leg returns to its original position. The steel cable is pulled by the counterweight of the insert counterweight unit. The steel cable pulls down the pull lug through the second transition guide wheel and the first transition guide wheel, thus pulling down the pull seat and the disc seat synchronously. At this time, the back pedal bearing seat returns to its original position, completing a set of back pedal leg training.

[0006] Furthermore, the arm and chest support unit includes two optical axes fixed to the support platform via guide rail brackets; a hollow support arm is slidably mounted on the optical axes via a sliding sleeve, arm support pads are fixed to the top of both ends of the support arm, a handle is fixed to the front end of the support arm, a lifting seat is fixed to the middle of the front end of the support arm, and a chest pad is fixed to the top of the lifting seat; a lifting knob is screwed onto the lifting seat, a perforated plate is fixed to the support platform directly below the support arm, and an adjustment pin that inserts into the perforated plate is screwed onto the middle of the support arm.

[0007] During training, the trainee lies prone on the prone support assembly. Specifically, loosen the adjustment pin and adjust the position of the support arm according to the trainee's height. When adjusting, loosen the adjustment pin so that the sliding sleeve at the bottom of the support arm slides in a straight line along the optical axis. After sliding into place, lock the adjustment pin with one hole in the perforated plate. After locking, loosen the lifting knob to adjust the height of the lifting seat to avoid stress on the trainee's lower back. After adjustment, lock the position of the lifting seat with the lifting knob. Then, the trainee supports their elbows on the arm support pads, holds the handles, and presses their chest against the top of the chest pad.

[0008] Furthermore, the knee pad unit includes a lower groove seat and an upper groove seat facing each other. Cylinder seats are rotatably mounted on both sides of the lower and upper groove seats via pins. Connecting arms are fixed between the upper and lower opposing cylinder seats. A limiting seat is fixed to the inner side of one set of connecting arms. The lower groove seat is fixed to an integrated base frame. A knee support pad is fixed to the top surface of the upper groove seat. The knee support pad supports the trainee's knee, and the limiting seat restricts the swing amplitude to prevent excessive displacement of the knee support pad. When left leg training is required, the knee support pad is pushed to the right, causing it to move towards the right side. That is, the two sets of connecting arms are connected via cylinders... The lower groove seat swings to the right, and the trainee kneels on the knee support pad with their right knee. At this time, the left leg can perform a back kick exercise. When the right leg needs to be trained, the knee support pad is pushed to the left, so that the knee support pad is moved to the left side. That is, the two sets of connecting arms swing to the left along the lower groove seat through the cylinder seat, and the trainee kneels on the knee support pad with their left knee. At this time, the right leg can perform a back kick exercise. The lower groove seat, upper groove seat, connecting arms and limiting seat form a swingable support body, which can support the left knee with the knee support pad on the left side and the right knee with the knee support pad on the right side according to the training needs of the left or right leg.

[0009] Furthermore, a handle is fixed to the top of the bottom surface of the swing table. When adjusting the tilt angle of the swing table, loosen the locking knob and pull down or push up the handle to complete the angle adjustment of the swing table. After the angle is adjusted, lock the angle by using the locking knob.

[0010] Furthermore, a ring of screw holes is provided on the disc base, and a swing arm is hinged at the center of the disc base. One end of the swing arm is screwed to a screw hole through an angle adjustment knob; the other end of the swing arm is fixed to the rear pedal force seat. In use, by rotating the angle adjustment knob outward and rotating the swing arm, the height between the rear pedal force seat and the knee pad unit in the initial state can be adjusted to accommodate trainees of different heights.

[0011] Compared with the prior art, the single-door insert prone leg kick training device of this utility model has the following advantages: 1. Compact and safe structure: It adopts a single-sided, single-door enclosed insert counterweight unit, which simplifies the frame structure and greatly reduces the width of the machine and the space occupied; the fully enclosed counterweight design avoids the safety hazards of exposed parts, and the pin-type weight adjustment operation is convenient and suitable for commercial gym scenarios; 2. High adaptability: The tilt angle of the swing platform can be infinitely adjusted via the telescopic rod, and the damping rod can be used to achieve smooth buffering; the arm and chest support unit can be adjusted forward and backward and in height in both directions, and the rear pedal force seat can be finely adjusted at the initial angle, which can fully adapt to users of different heights and leg lengths and ensure standard force exertion posture. 3. High power generation efficiency: The sliding disc seat drives the rear pedal force seat to move along a straight track, and the trajectory is highly consistent with the human hip joint extension force generation path; the two-stage transition guide wheel transmission design ensures smooth and lossless resistance transmission, and continuous and uniform muscle tension, which can accurately isolate and stimulate the gluteus maximus and hamstring muscles. 4. High training efficiency: The knee pad unit can swing left and right, allowing for quick switching between left and right leg training without adjusting body posture, making it easy to operate; the rigid upper body support structure can avoid lumbar compensation, improving training safety and the efficiency of target muscle group stimulation. Attached Figure Description

[0012] Figure 1 This is a top view schematic diagram of the single-door insert prone leg kick training device of this utility model.

[0013] Figure 2 This is a schematic diagram of the left side of the single-door insert prone leg kick training device of this utility model.

[0014] Figure 3 This is a schematic diagram of the right side of the single-door insert prone leg kick training device of this utility model.

[0015] Figure 4 This is a schematic diagram of the front end structure of the single-door insert prone leg kick training device of this utility model.

[0016] Figure 5 This is a schematic diagram of the rear end structure of the single-door insert prone leg kick training device of this utility model.

[0017] Reference numerals: 1. Integrated base frame; 2. Support platform; 3. Arm and chest support unit; 4. Knee pad unit; 5. Insert counterweight unit; 6. Swinging platform; 7. Support body; 8. Hinge seat; 9. Telescopic rod; 10. Locking knob; 11. Damping rod; 12. Disc base; 13. Rear pedal force-bearing seat; 14. Pull seat; 15. Pull lug; 16. First transition guide wheel; 17. Second transition guide wheel; 18. Steel wire rope. 19. Guide rail bracket; 20. Optical axis; 21. Sliding sleeve; 22. Support arm; 23. Arm support pad; 24. Handle; 25. Lifting seat; 26. Chest pad; 27. Lifting knob; 28. Hole plate; 29. ​​Adjusting pin; 30. Lower slot seat; 31. Upper slot seat; 32. Cylinder seat; 33. Connecting arm; 34. Limit seat; 35. Knee support pad; 36. Handle; 37. Screw hole; 38. Swing arm; 39. Angle adjustment knob. Detailed Implementation

[0018] Example: like Figures 1 to 5 The training equipment shown, featuring a single-plate prone leg extension exercise, includes: Integrated base frame 1, which serves as the load-bearing foundation for the entire machine, is made of welded steel to ensure the overall structural strength and stability; The prone support assembly is fixed to the front side of the integrated base frame 1. The prone support assembly includes a support platform 2, and an arm and chest support unit 3 is provided above the support platform 2. A knee pad unit 4 is fixed directly behind the arm and chest support unit 3 of the integrated base frame 1. The insert weight unit 5 is fixed on the opposite side of the prone support assembly on the integrated base frame 1. The insert weight unit 5 is a single-door closed cabinet structure with multiple weight blocks stacked vertically inside. Different combinations of weight blocks can be selected through pins to adjust the training resistance. The fully enclosed design of the weight enhances the safety of use, and the overall structure is compact and occupies little space. The prone support assembly is fixed on the front left side of the integrated base frame 1 to support the weight of the trainee's upper body and fix the posture. The insert weight unit 5 is fixed on the front right side of the integrated base frame 1 and is arranged opposite to the prone support assembly, forming a compact layout of single-side single-door weights, which effectively reduces the width of the whole machine. The rear leg force unit includes a swing platform 6 and a support body 7 located close to the front end of the insert counterweight unit 5. A hinge seat 8 is fixed to the top of the support body 7, and a pin seat is fixed to the lower part of the top surface of the swing platform 6. The hinge seat 8 and the pin seat are hinged together by a hinge shaft, allowing the swing platform 6 to rotate as a whole around the hinge shaft to adjust the tilt angle. A telescopic rod 9 is hinged to the front end of the support body 7 and the bottom surface of the swing platform 6 of the integrated base frame 1. A locking knob 10 is screwed onto the telescopic rod 9. A damping rod 11 is fixed to the telescopic end and the fixed end of the telescopic rod 9. The damping rod 11 provides buffering during angle adjustment to prevent impact or hand pinching caused by rapid rotation of the swing platform 6. A disc seat 12 is slidably mounted on the swing platform 6. A rear leg force seat 13 is fixed to the front end of the disc seat 12, which can slide back and forth along the length of the swing platform 6. The rear leg force seat 13 is fixed to the front end of the disc seat 12 for the trainee to exert force by pushing off with their feet. The transmission unit includes a pull seat 14 fixed to the back of the disc base 12, a pull lug 15 hinged to the pull seat 14, a first transition guide wheel 16 rotatably mounted on the back of the hinge seat 14, and a second transition guide wheel 17 fixed below the first transition guide wheel 16 on the integrated base frame 1; a steel wire rope 18 is fixed to the pull lug 15, the steel wire rope 18 extends backward along the swing table 6, passes around the first transition guide wheel 16 and the second transition guide wheel 17 respectively, and after completing two turns, connects vertically upward to the lifting end (counterweight pin seat) of the insert counterweight unit 5. During training, adjust the sliding path of the push-off support seat 13 according to the trainee's height by loosening the locking knob 10. Then, push up or pull down the swing platform 6 to rotate and swing along the telescopic rod 9 and the hinge seat 8 respectively, adjusting the tilt angle of the swing platform 6. After adjustment, lock the length of the telescopic rod 9 using the locking knob 10. Next, according to the trainee's strength training needs, insert the pin into a specific weight socket. After completing the pre-training adjustments, the prone push-off can begin. During training, the trainee lies prone on top of the prone support assembly, supported by the arm and chest support units 3. The knee pad unit 4 supports the trainee's knees. Then, the trainee performs push-off training, with the left or right foot touching the push-off support seat 13. Pushing the rear pedal support seat 13 backward and upward in a straight line, when the rear pedal support seat 13 is pushed, the disc seat 12 and the pull seat 14 are pushed synchronously, so the pull lug 15 on the pull seat 14 is pushed synchronously. At this time, the pull lug 15 pulls the steel wire rope 18. The steel wire rope 18 is guided by the first transition guide wheel 16, the second transition guide wheel 17 and the guide wheel inside the insert counterweight unit 5, and pulls the lifting end of the insert counterweight unit 5 upward in a straight line. The counterweight of the insert counterweight unit 5 provides resistance for the rear pedal operation. After the leg completes the rear pedal operation, the leg returns to its original position, and the steel wire rope 18 is pulled by the counterweight of the insert counterweight unit 5. The steel wire rope 18 pulls down the pull lug 15 through the second transition guide wheel 17 and the first transition guide wheel 16, so the pull seat 14 and the disc seat 12 are pulled down synchronously. At this time, the rear pedal support seat 13 returns to its original position, completing a set of rear pedal leg training.

[0019] The arm and chest support unit 3 includes two optical axes 20 fixed to the support platform 2 via guide rail brackets 19; hollow support arms 22 are slidably mounted on the optical axes 20 via sliding sleeves 21. Arm support pads 23 are fixed to the top of both ends of the support arms 22 to support the trainee's elbows. A handle 24 is fixed to the front end of the support arms 22 for the trainee to hold and stabilize the upper body. A lifting seat 25 is fixed to the middle of the front end of the support arms 22. A chest pad 26 is fixed to the top of the lifting seat 25 to support the weight of the chest; a lifting knob 27 is screwed onto the lifting seat 25. When loosened, the support height of the chest pad 26 can be adjusted, and when locked, the position can be fixed; a perforated plate 28 is fixed to the support platform 2 directly below the support arms 22. An adjusting pin 29 is screwed onto the middle of the support arms 22 and inserted into the perforated plate 28. The adjusting pin 29 can be inserted into different holes in the perforated plate 28 to lock the front and rear positions of the support arms 22, adapting to users with different torso lengths; During training, the trainee lies prone on the prone support assembly. Specifically, loosen the adjustment pin 29 and adjust the position of the support arm 22 according to the trainee's height. When adjusting, loosen the adjustment pin 29 so that the sliding sleeve 21 at the bottom of the support arm 22 slides linearly along the optical axis 20. After sliding into place, lock the adjustment pin 29 with one hole of the perforated plate 28. After locking, loosen the lifting knob 27 to adjust the height of the lifting seat 25 to avoid stress on the trainee's waist. After adjustment, lock the position of the lifting seat 25 with the lifting knob 27. Then, the trainee supports their elbows on the arm support pad 23, holds the handle 24, and presses their chest against the top surface of the chest pad 26.

[0020] The knee pad unit 4 includes a lower groove seat 30 and an upper groove seat 31 facing each other. Cylindrical seats 32 are rotatably mounted on both sides of the lower groove seat 30 and the upper groove seat 31 via pins. A connecting arm 33 is fixed between the upper and lower opposing cylindrical seats 32. A limiting seat 34 is fixed to the inner side of one set of connecting arms 33 to limit the swing amplitude and prevent excessive displacement of the knee pad. The lower groove seat 30 is fixed to the integrated base frame 1. A knee support pad 35 is fixed to the top surface of the upper groove seat 31. The knee support pad 35 supports the trainee's knee, and the limiting seat 34 limits the swing amplitude and prevents excessive displacement of the knee support pad 35. When left leg training is required, the knee support pad 35 is pushed to the right, causing the knee support pad 35 to move to the right side. The two sets of connecting arms 33 swing to the right along the lower groove seat 30 via the cylinder seat 32, with the trainee kneeling on the knee support pad 35. At this time, the left leg can perform a back kick training. When the right leg needs to be trained, the knee support pad 35 is pushed to the left, so that the knee support pad 35 is moved to the left side. That is, the two sets of connecting arms 33 swing to the left along the lower groove seat 30 via the cylinder seat 32, with the trainee kneeling on the knee support pad 35. At this time, the right leg can perform a back kick training. The lower groove seat 30, upper groove seat 31, connecting arms 33 and limiting seat 34 form a swingable support body, which can support the left knee on the left side and the right knee on the right side according to the training needs of the left or right leg.

[0021] A handle 36 is fixed to the top of the bottom surface of the swing platform 6, which makes it convenient to pull the swing platform 6 to adjust the angle. When adjusting the tilt angle of the swing platform 6, loosen the locking knob 10 and pull down or push the handle 36 to complete the angle adjustment of the swing platform 6. After the angle is adjusted, lock the angle by locking the knob 10.

[0022] A ring of screw holes 37 is provided on the disc base 12. A swing arm 38 is hinged at the center of the disc base 12. One end of the swing arm 38 is screwed to a screw hole 37 through an angle adjustment knob 39. The other end of the swing arm 38 is fixed to the rear pedal force seat 13. In use, the angle adjustment knob 39 is rotated outward and the swing arm 38 is rotated to adjust the height between the rear pedal force seat 13 and the knee pad unit 4 in the initial state, which can accommodate trainees of different heights.

[0023] The working and usage process of this utility model of a single-door insert prone leg-kicking training device is as follows: Pre-training adjustment: Angle adjustment of swing table 6: Loosen the locking knob 10, push and pull the swing table 6 through the handle 36 to rotate it around the hinge axis to the target tilt angle, tighten the locking knob 10 to lock the length of the telescopic rod 9; the damping rod 11 provides buffering during the adjustment process to ensure smooth operation; Upper body support adjustment: Loosen the adjustment pin 29, slide the support arm 22 back and forth along the optical axis 20 to the appropriate position, and screw in the adjustment pin 29 to lock; loosen the lifting knob 27, adjust the height of the chest pad 26 until the trainee's waist is not under pressure, and lock the lifting knob 27. Knee pad position adjustment: Select the leg to train, push the knee pad left and right 35 degrees to swing it to the side of the non-trained leg to support the corresponding knee; Rear pedal seat fine adjustment: Loosen the angle adjustment knob 39, rotate the swing arm 38 to adjust the initial angle and height of the rear pedal bearing seat 13 to ensure a comfortable fit for the feet, and then tighten the angle adjustment knob 39. Weight adjustment: Insert the pin of the insert weight unit 5 into the hole of the corresponding weight plate and select the appropriate training resistance; Training procedure: The trainee lies prone on the machine with the chest against the chest pad 26, the elbows supported by the arm support pad 23, and the hands holding the handles 24 to stabilize the upper body; the non-training leg kneels on the knee support pad 35, and the training leg's foot pushes against the back push-up seat 13. Concentric force exertion phase: The legs push backward and upward, causing the rear push-off force seat 13 and the disc seat 12 to slide backward and upward along the swing platform 6; the pull seat 14 and pull ear 15 on the back of the disc seat 12 move synchronously, pulling the steel wire rope 18, and after turning twice through the first transition guide wheel 16 and the second transition guide wheel 17, the counterweight block of the insert counterweight unit 5 is vertically lifted, and the counterweight gravity is the training resistance, completing the hip joint extension force exertion; Reset phase: The legs slowly release the force, and the counterweight falls under the action of gravity. The steel wire rope 18 pulls the pull ear 15 and the plate seat 12 in the opposite direction, which drives the rear pedal force seat 13 to slide forward and downward along the swing platform 6 to reset. The muscles complete the eccentric contraction, thus completing one complete movement cycle.

[0024] The above embodiments are merely preferred embodiments of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model are included within the scope of the present utility model.

Claims

1. A training device for prone leg extension exercises with a single-door insert plate, characterized in that: include: Integrated base frame; A prone support assembly is fixed to the front side of an integrated base frame. The prone support assembly includes a support platform, and an arm and chest support unit is provided above the support platform. A knee pad unit is fixed to the rear of the arm and chest support unit on the integrated base frame. The integrated base frame has a counterweight unit fixed on the opposite side of the prone support assembly. The rear pedal force-bearing unit includes a swing platform and a support body located close to the front end of the insert counterweight unit. A hinge seat is fixed to the top of the support body, and a pin seat is fixed to the lower part of the top surface of the swing platform. The hinge seat and the pin seat are hinged together by a hinge shaft. A telescopic rod is hinged to the front end of the support body and the bottom surface of the swing platform of the integrated base frame. A locking knob is screwed onto the telescopic rod, and damping rods are fixed to the telescopic end and the fixed end of the telescopic rod. A disc seat is slidably arranged on the swing platform, and a rear pedal force-bearing seat is fixed to the front end face of the disc seat. The transmission unit includes a pull seat fixed to the back of the disc base, a pull lug hinged to the pull seat, a first transition guide wheel rotatably disposed on the back of the hinge seat, and a second transition guide wheel fixed below the first transition guide wheel on the integrated base frame; a steel wire rope is fixed to the pull lug, and the steel wire rope passes around the first transition guide wheel and the second transition guide wheel respectively and is connected to the lifting end of the insert counterweight unit.

2. The training device for prone leg extension with a single insert plate according to claim 1, characterized in that: The arm and chest support unit includes two optical axes fixed to the support platform via guide rail brackets; a hollow support arm is slidably mounted on the optical axes via a sliding sleeve, arm support pads are fixed to the top of both ends of the support arm, a handle is fixed to the front end of the support arm, a lifting seat is fixed to the middle of the front end of the support arm, and a chest pad is fixed to the top of the lifting seat; a lifting knob is screwed onto the lifting seat, a perforated plate is fixed to the support platform directly below the support arm, and an adjustment pin that inserts into the perforated plate is screwed onto the middle of the support arm.

3. The training device for single-door insert prone leg extension as described in claim 1, characterized in that: The knee pad unit includes a lower groove seat and an upper groove seat facing each other. A cylindrical seat is rotatably mounted on both sides of the lower groove seat and the upper groove seat via a pin. A connecting arm is fixed between the upper and lower cylindrical seats facing each other. A limit seat is fixed on the inner side of a set of connecting arms. The lower groove seat is fixed to an integrated base frame. A knee support pad is fixed on the top surface of the upper groove seat.

4. The training device for prone leg extension with a single insert plate according to claim 1, characterized in that: A handle is fixed to the top of the bottom surface of the swing platform.

5. The training device for single-door insert prone leg extension according to claim 1, characterized in that: A ring of screw holes is provided on the disc base, and a swing arm is hinged at the center of the disc base. One end of the swing arm is screwed to a screw hole through an angle adjustment knob; the other end of the swing arm is fixed to the rear pedal force seat.

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