Abdominal muscle trainer
By designing a hinge four-bar mechanism and extension frame in the abdominal muscle trainer, the wear problem caused by stress concentration in the prior art is solved, and the stability of the equipment and user experience are improved.
Patent Information
- Application Number
- CN202421904570.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-07
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-07
AI Technical Summary
When the existing abdominal muscle training machine performs a backward movement, the stress is concentrated between the connecting rod frame and the rotary shaft frame, which may cause structural wear and affect the stability of use.
An abdominal muscle training device is designed, which includes a support frame, a seat cushion, a back support assembly and a connecting rod structure. The backrest assembly includes a fixing frame, a support member and an extension frame, and the connecting rod structure forms a hinged four-bar mechanism through the first connection member, the second connection member and the fixing member, limiting the rotation range of the fixing frame and providing additional support through the extension frame.
Through the design of the hinged four-bar mechanism, the rotation range of the fixture is limited, stress concentration is reduced, the service life of the connecting rod structure is extended, and the stability and user experience of the abdominal muscle trainer are improved.
Smart Images
Figure CN223009729U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fitness equipment, and more specifically, to an abdominal muscle trainer. Background Art
[0002] With the continuous improvement of the health awareness of contemporary people, fitness has gradually become a part of daily life. An abdominal muscle trainer is a fitness equipment for exercising and strengthening the abdominal muscles. Through specific movements and resistance, the abdominal muscles can be fully exercised and stimulated, which can help burn abdominal fat and shape clearer abdominal muscle lines.
[0003] The prior art discloses an abdominal muscle training machine, which includes a chassis, a seat cushion assembly, a rotating shaft frame and a backrest cushion assembly. The seat cushion assembly is connected to the chassis, the backrest cushion assembly is arranged at the rear side of the seat cushion assembly, the rotating shaft frame is arranged between the seat cushion assembly and the backrest cushion assembly. The backrest cushion assembly includes a backrest cross frame and a backrest support. The backrest cross frame is rotatably connected to the rotating shaft frame through a connecting rod assembly, and the backrest support is rotatably connected to the rotating shaft frame through a connecting rod frame, so that the backrest cushion assembly can rotate relative to the rotating shaft frame within a preset angle range, thereby ensuring that the training machine can provide stable and effective exercise effects. Further, a limit block is arranged on the connecting rod frame, an arc-shaped slot is opened on the limit block, and a limit bolt is arranged on the rotating shaft frame. When the connecting rod frame rotates relative to the rotating shaft frame until the limit bolt falls into the arc-shaped slot, the backrest cushion assembly can be restricted from continuing to rotate backward.
[0004] However, the human body and the seat cushion assembly as a whole have a certain weight. When the user performs a backward tilt action and the arc-shaped slot on the limit block and the limit bolt form a limit fit, the stress is concentrated between the connecting rod frame and the rotating shaft frame, which may cause wear on both of them in terms of structure, thereby affecting the use stability of the abdominal muscle training machine. Summary of the Utility Model
[0005] The purpose of the utility model is to provide an abdominal muscle trainer, and the technical problem to be solved is: how to improve the use stability.
[0006] To solve the above technical problem, the utility model adopts the following technical solutions.
[0007] The utility model provides an abdominal muscle trainer, which includes:
[0008] Support frame; seat cushion, connected to the support frame; backrest assembly, provided at the rear side of the seat cushion, the backrest assembly includes a fixed frame, a backrest member and an extension frame, the backrest member and the extension frame are respectively connected to the fixed frame; a link structure, including a first connecting member, a second connecting member and a fixing member, the first ends of the first connecting member and the second connecting member are respectively rotatably connected to different positions of the support frame, the second ends of the first connecting member and the second connecting member are respectively rotatably connected to both ends of the fixing member, the fixing member is connected to the fixed frame, so as to form a quadrilateral structure between the first connecting member, the second connecting member, the fixing member and the support frame, and the fixed frame can rotate back and forth within a preset angle range relative to the support frame; when the fixed frame rotates backward relative to the support frame, it can drive the extension frame to rotate backward until it abuts against the lower end of the support frame.
[0009] In some embodiments of the present application, the fixing member includes a first fixing member and a second fixing member arranged side by side at intervals, one ends of the first fixing member and the second fixing member are both rotatably connected to the second end of the first connecting member; a positioning opening is provided at the other end of the first fixing member, the fixed frame passes through the positioning opening and is connected to the second fixing member; the other end of the second fixing member is rotatably connected to the second end of the second connecting member.
[0010] In some embodiments of the present application, an arc transition section is provided between both ends of the second fixing member, and the arc transition section is connected to the fixed frame.
[0011] In some embodiments of the present application, a first extension member and a second extension member are provided on one side of the support frame facing the fixing member, the first end of the first connecting member is rotatably connected to the support frame through the first extension member, and the first end of the second connecting member is rotatably connected to the support frame through the second extension member.
[0012] In some embodiments of the present application, the link structure further includes a first locking member and a second locking member, both the first locking member and the second locking member are provided with a rod portion and a cap portion; the rod portion of the first locking member is locked to the second extension member, the first end of the second connecting member is rotatably sleeved on the rod portion of the first locking member and is limited between the cap portion of the first locking member and the second extension tube; the rod portion of the second locking member is locked to the fixing member, the second end of the second connecting member is rotatably sleeved on the rod portion of the second locking member and is limited between the cap portion of the second locking member and the fixing member.
[0013] In some embodiments of the present application, the second connecting member includes a connecting rod and two rotating members. Each rotating member includes a fixed portion and a rotating portion, and the rotating portion is rotatably disposed within the fixed portion. The fixed portions of the two rotating members are respectively connected to two ends of the connecting rod, and the rotating portions of the two rotating members are respectively rotatably sleeved on the rod portion of the first locking member and the rod portion of the second locking member.
[0014] In some embodiments of the present application, the fixed portion includes a body and a rod body connected to each other. The two ends of the connecting rod are provided with internal threads, and the rod body is provided with external threads. The rod body is screwed onto the connecting rod, and the rotating portion is rotatably disposed within the body.
[0015] In some embodiments of the present application, the abdominal muscle trainer further includes a footrest. The footrest is disposed on the front side of the seat cushion, and the position of the footrest is higher than that of the seat cushion.
[0016] In some embodiments of the present application, there are multiple groups of footrests, and the multiple groups of footrests are disposed at different height positions.
[0017] In some embodiments of the present application, a suspension rod is provided on the extension frame, and the suspension rod is used for suspending barbell plates.
[0018] From the above technical solutions, it can be seen that the embodiments of the present utility model have at least the following advantages and positive effects:
[0019] In the abdominal muscle trainer according to the embodiment of the present utility model, before starting the exercise, the user sits on the seat cushion and leans the back against the backrest member of the backrest assembly. When performing abdominal muscle training, the user uses the strength of the waist and abdomen to overcome the overall weight of the backrest assembly, driving the fixed frame to rotate forward relative to the support frame, thereby simulating the action of the upper body bending forward during sit-ups. Subsequently, the user's back pushes against the backrest member, driving the fixed frame to rotate backward relative to the support frame, thereby simulating the action of the upper body leaning backward during sit-ups. By repeating multiple groups of actions of the upper body bending forward and the upper body leaning backward, the effect of exercising the waist and abdomen can be achieved. During the training process, adaptive rotations will occur at each rotating connection of the first connecting member, the second connecting member, and the fixing member. Since a hinge four-bar mechanism is formed among the first connecting member, the second connecting member, the fixing member, and the support frame, based on the characteristics of the hinge four-bar mechanism, the first connecting member and the second connecting member can only reciprocally swing within a certain angle range, restricting the range within which the fixed frame can rotate forward and backward relative to the support frame, thereby ensuring the standardization of the user's actions of the upper body bending forward and the upper body leaning backward, and effectively exercising the abdominal muscles.
[0020] Furthermore, when performing the action of leaning the upper body backward, the fixing frame drives the extension frame to rotate backward, and the extension frame rotates until it abuts against the lower end of the support frame, thereby providing additional support between the support frame and the backrest component, reducing the stress concentration between the link structure and the support frame, thereby improving the overall stability of the abdominal exerciser and enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Various objects, features, and advantages of the present utility model will become more apparent by considering the following detailed description of the preferred embodiments of the present utility model in conjunction with the accompanying drawings. The drawings are only exemplary illustrations of the present utility model and are not necessarily drawn to scale. In the drawings, the same reference numerals always represent the same or similar components. Among them:
[0022] Figure 1 is a schematic structural diagram of an abdominal exerciser shown according to an exemplary embodiment.
[0023] Figure 2 is Figure 1 a schematic structural diagram of another perspective of
[0024] Figure 3 is Figure 1 an enlarged schematic diagram of the link structure in
[0025] Figure 4 is Figure 3 an exploded structural diagram of the second connecting member, the second fixing member, and the second extension member in
[0026] Figure 5 is Figure 4 an exploded structural diagram of the second connecting member in
[0027] The description of the reference numerals is as follows: 1, support frame; 11, first extension member; 12, second extension member;
[0028] 2, seat cushion;
[0029] 31, fixing frame; 32, backrest member; 321, back pad; 322, head pad; 33, extension frame; 34, handle;
[0030] 41, first connecting member; 42, second connecting member; 421, connecting rod; 422, rotating member; 4221, fixing portion; 4222, rotating portion; 4223, inner copper sleeve; 43, fixing member; 431, first fixing member; 4311, positioning port; 432, second fixing member; 44, first locking member; 45, second locking member;
[0031] 6, footrest member;
[0032] 7, suspension rod;
[0033] 8. Roller Detailed implementation mode
[0034] Although the utility model can be easily embodied in different forms of embodiments, only some specific embodiments are shown in the drawings and will be described in detail in this specification. At the same time, it can be understood that this specification should be regarded as a demonstration of the principles of the utility model, rather than aiming to limit the utility model to what is described herein.
[0035] Therefore, a feature pointed out in this specification will be used to illustrate one of the features of an embodiment of the utility model, rather than implying that each embodiment of the utility model must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined to show a possible system design, these features can also be used in other combinations that are not explicitly described. Therefore, unless otherwise stated, the described combination is not intended to be limiting.
[0036] In the embodiments shown in the drawings, the indication of directions (such as up, down, left, right, front and back) is used to explain that the structures and movements of various elements of the utility model are not absolute but relative. When these elements are in the positions shown in the drawings, these explanations are appropriate. If the description of the positions of these elements changes, then the indication of these directions also changes accordingly.
[0037] Please refer to Figures 1 to 5 , an abdominal muscle trainer provided by an embodiment of the utility model mainly includes a support frame 1, a seat cushion 2 and a back support assembly. The seat cushion 2 is connected to the support frame 1. The back support assembly is arranged at the rear side of the seat cushion 2. The back support assembly includes a fixed frame 31, a back support member 32 and an extension frame 33. The back support member 32 and the extension frame 33 are respectively connected to the fixed frame 31. The link structure includes a first connecting member 41, a second connecting member 42 and a fixing member 43. The first end of the first connecting member 41 and the first end of the second connecting member 42 are respectively rotatably connected to different positions of the support frame 1. The second end of the first connecting member 41 and the second end of the second connecting member 42 are respectively rotatably connected to both ends of the fixing member 43. The fixing member 43 is connected to the fixed frame 31, so as to form a quadrilateral structure between the first connecting member 41, the second connecting member 42, the fixing member 43 and the support frame 1, and the fixed frame 31 can rotate back and forth within a preset angle range relative to the support frame 1. When the fixed frame 31 rotates backward relative to the support frame 1, it can drive the extension frame 33 to rotate backward until it abuts against the lower end of the support frame 1.
[0038] In the abdominal muscle trainer according to the embodiment of the present utility model, before starting the exercise, the user sits on the seat cushion 2, and the back leans against the backrest member 32 of the backrest assembly. When performing abdominal muscle training, the user uses the strength of the waist and abdomen to overcome the overall weight of the backrest assembly, driving the fixing frame 31 to rotate forward relative to the support frame 1, thereby simulating the action of the upper body bending forward during sit-ups. Subsequently, the user's back pushes against the backrest member 32, driving the fixing frame 31 to rotate backward relative to the support frame 1, thereby simulating the action of the upper body leaning backward during sit-ups. By repeating multiple sets of actions of the upper body bending forward and the upper body leaning backward, the effect of exercising the waist and abdomen can be achieved. During the training process, adaptive rotations will occur at each rotational connection of the first connecting member 41, the second connecting member 42, and the fixing member 43. Since a hinge four-bar mechanism is formed between the first connecting member 41, the second connecting member 42, the fixing member 43, and the support frame 1, based on the characteristics of the hinge four-bar mechanism, the first connecting member 41 and the second connecting member 42 can only reciprocally swing within a certain angle range, restricting the range within which the fixing frame 31 can rotate forward and backward relative to the support frame 1, thereby ensuring the standardization of the user's actions of the upper body bending forward and the upper body leaning backward, and effectively exercising the abdominal muscles. Further, when performing the action of the upper body leaning backward, the fixing frame 31 drives the extension frame 33 to rotate backward, and the extension frame 33 rotates until it abuts against the lower end of the support frame 1, thereby providing additional support between the support frame 1 and the backrest assembly, reducing the phenomenon of stress concentration between the link structure and the support frame 1, thereby improving the overall use stability of the abdominal muscle trainer and enhancing the user's experience.
[0039] On the other hand, the first connecting member 41 and the second connecting member 42 are connected to the fixing frame 31 through the fixing member 43, making the overall structure of the link structure more compact and enabling smooth movement.
[0040] Please refer to Figure 1 and Figure 2 , in this embodiment, the backrest assembly further includes a handle 34. The handle 34 is connected to the fixing frame 31, and the handle 34 provides a force application point for the user's waist and abdomen to drive the fixing frame 31 to rotate forward relative to the support frame 1.
[0041] Please refer to Figure 1 and Figure 3 , the fixing member 43 includes a first fixing member 431 and a second fixing member 432 arranged side by side at intervals. One end of the first fixing member 431 and one end of the second fixing member 432 are both rotatably connected to the second end of the first connecting member 41 through a rotating shaft. A positioning port 4311 is provided at the other end of the first fixing member 431. The fixing frame 31 passes through the positioning port 4311 and is connected to the second fixing member 432. The other end of the second fixing member 432 is rotatably connected to the second end of the second connecting member 42. The first fixing member 431 provides additional support for the fixing frame 31, improving the connection stability between the fixing member 43 and the fixing frame 31.
[0042] Please refer to Figures 1 to 4 , there is an arc transition section between the two ends of the second fixing member 432, and the arc transition section is connected to the fixing bracket 31. The design of the arc transition section helps to disperse stress and extend the service life of the second fixing member 432.
[0043] Please refer to Figure 1 and Figure 3 , on the side of the support frame 1 facing the fixing member 43, there are a first extension member 11 and a second extension member 12. The first end of the first connecting member 41 is rotatably connected to the support frame 1 through the first extension member 11, and the first end of the second connecting member 42 is rotatably connected to the support frame 1 through the second extension member 12. The first extension member 11 and the second extension member 12 respectively provide stable connection points between the first connecting member 41 and the support frame 1 and between the first connecting member 41 and the support frame 1, and the arrangement of the first extension member 11 and the second extension member 12 can avoid the collision and friction between the first connecting member 41 and the second connecting member 42 and the support frame 1, making the overall movement of the link structure smoother.
[0044] Exemplarily, in an implementation manner where the first end of the first connecting member 41 is rotatably connected to the support frame 1 through the first extension member 11, the first extension member 11 is a short shaft, and a bushing adapted to the short shaft is provided on the first end of the first connecting member 41, and the short shaft is rotatably sleeved in the bushing, so as to realize the relative rotation of the first end of the first connecting member 41 with respect to the first extension member 11.
[0045] Exemplarily, the support frame 1 is provided with a first through hole, the short shaft passes through the first through hole, and the short shaft is locked in the first through hole by a screw. Please refer to Figure 4, in an embodiment where the first end of the second connecting member 42 is rotatably connected to the support frame 1 through the second extension member 12, and the other end of the second fixing member 432 is rotatably connected to the second end of the second connecting member 42, the link structure further includes a first locking member 44 and a second locking member 45. Both the first locking member 44 and the second locking member 45 are provided with a rod portion and a cap portion. The rod portion of the first locking member 44 is locked to the second extension member 12. The first end of the second connecting member 42 is rotatably sleeved on the rod portion of the first locking member 44 and is limited between the cap portion of the first locking member 44 and the second extension member 12. The rod portion of the second locking member 45 is locked to the second fixing member 432. The second end of the second connecting member 42 is rotatably sleeved on the rod portion of the second locking member 45 and is limited between the cap portion of the second locking member 45 and the second fixing member 432. The structures and connection relationships of the first locking member 44 and the second locking member 45 ensure the rotatability of the second connecting member 42, and the arrangements of the first locking member 44 and the second locking member 45 facilitate the disassembly and replacement of the second connecting member 42, reducing the difficulty of maintenance. In a further embodiment, both the first locking member 44 and the second locking member 45 are screws.
[0046] Exemplarily, the support frame 1 is further provided with a notch. The second extension member 12 is in a cylindrical shape, and the first extension member 11 is welded to the edge of the notch.
[0047] Please refer to Figure 5 , in an embodiment where the first end of the second connecting member 42 is rotatably sleeved on the rod portion of the first locking member 44, and the second end of the second connecting member 42 is rotatably sleeved on the rod portion of the second locking member 45, the second connecting member 42 includes a connecting rod 421 and two rotating members 422. The rotating member 422 includes a fixing portion 4221 and a rotating portion 4222. The rotating portion 4222 is rotatably disposed within the fixing portion 4221. The fixing portions 4221 of the two rotating members 422 are respectively connected to both ends of the connecting rod 421, and the rotating portions 4222 of the two rotating members 422 are respectively rotatably sleeved on the rod portion of the first locking member 44 and the rod portion of the second locking member 45. The specific structure of the second connecting member 42 ensures that both ends of the second connecting member 42 can be respectively rotatably sleeved on the rod portion of the first locking member 44 and the rod portion of the second locking member 45, and the refinement of the connecting rod 421 and the two rotating members 422 facilitates the disassembly and replacement of the specific ends of the second connecting member 42. It can be conceived that the two rotating members 422 are the first end and the second end of the second connecting member 42.
[0048] In a further embodiment, the fixing part 4221 includes a connected body and a rod. The two ends of the connecting rod 421 are provided with internal threads, and the rod is provided with external threads. The rod is screwed onto the connecting rod 421, and the rotating part 4222 is rotatably arranged in the body. The fixing part 4221 and the connecting rod 421 are fixed by means of threaded connection, with low disassembly and assembly difficulty and strong connection tightness.
[0049] In a still further embodiment, the rotating member 422 further includes a copper lining sleeve 4223, and the copper lining sleeve 4223 is arranged between the body of the fixing part 4221 and the rotating part 4222.
[0050] Please refer to Figure 1 and Figure 2 , the abdominal muscle trainer further includes a footrest 6, and the footrest 6 is arranged on the front side of the seat cushion 2 and the position of the footrest 6 is higher than that of the seat cushion 2. The footrest 6 arranged on the front side of the seat cushion 2 can provide stable foot support for the user. Since the position of the footrest 6 is higher than that of the seat cushion 2, when the user steps on the footrest 6 with the feet, a fold angle will be formed between the upper body and the lower body. When the user performs forward flexion of the upper body, the feet will exert force on the footrest 6, so as to keep the body stable during the training. On the other hand, the formation of the fold angle also further increases the training difficulty and can slightly exercise the leg muscles, enhancing the overall training effect.
[0051] In a further embodiment, there are multiple groups of footrests 6, and the multiple groups of footrests 6 are arranged at different height positions. The design of the multiple groups of footrests 6 provides height adjustability, enabling the device to adapt to users of different heights and training needs and increasing the versatility and adaptability of the device.
[0052] Please refer to Figure 1 and Figure 2 , a suspension rod 7 is arranged on the extension frame 33, and the suspension rod 7 is used for suspending barbell plates. By suspending barbell plates on the suspension rod 7 and increasing or decreasing the number of barbell plates, the training intensity can be adjusted, further increasing the versatility and adaptability of the device.
[0053] Please refer to Figure 1 and Figure 2 , in the above embodiments, the abdominal muscle trainer further includes a roller 8, and the roller 8 is rotatably connected to the support frame 1 and arranged at the rear side of the support frame 1. The setting of the roller 8 facilitates moving the abdominal muscle trainer to different positions.
[0054] In the above embodiments, the backrest support 32 includes a back pad 321 and a head pad 322, and the back pad 321 and the head pad 322 are respectively connected to the fixing frame 31.
[0055] While the present utility model has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present utility model can be embodied in many forms without departing from the spirit or essence of the utility model, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be broadly construed within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.
Claims
1. An abdominal muscle training device, characterized in that: include: Support frame; A seat cushion connected to the support frame; A back support assembly is arranged at the rear side of the seat cushion, the back support assembly comprises a fixing frame, a back support member and an extension frame, the back support member and the extension frame are respectively connected to the fixing frame; A connecting rod structure, comprising a first connecting member, a second connecting member and a fixing member, wherein the first end of the first connecting member and the first end of the second connecting member are rotatably connected to different positions of the support frame, the second end of the first connecting member and the second end of the second connecting member are rotatably connected to two ends of the fixing member, the fixing member is connected to the fixing frame, so that a quadrilateral structure is formed between the first connecting member, the second connecting member, the fixing member and the support frame, and the fixing frame can rotate back and forth relative to the support frame within a preset angle range; When the fixing frame rotates rearward relative to the supporting frame, the extending frame can be driven to rotate rearward until it abuts against the lower end of the supporting frame.
2. The abdominal muscle training device according to claim 1, characterized in that: The fixing member comprises a first fixing member and a second fixing member which are arranged side by side and spaced apart from each other, and one end of the first fixing member and one end of the second fixing member are both rotatably connected to the second end of the first connecting member; The other end of the first fixing member is provided with a positioning opening, and the fixing frame passes through the positioning opening and is connected to the second fixing member; The other end of the second fixing member is rotatably connected to the second end of the second connecting member.
3. The abdominal muscle training device according to claim 2, characterized in that: An arc-shaped transition section is provided between the two ends of the second fixing member, and the arc-shaped transition section is connected to the fixing frame.
4. The abdominal muscle training device according to claim 1, characterized in that: A first extension member and a second extension member are provided on a side of the support frame facing the fixing member, the first end of the first connecting member is rotatably connected to the support frame via the first extension member, and the first end of the second connecting member is rotatably connected to the support frame via the second extension member.
5. The abdominal muscle training device according to claim 4, characterized in that: The connecting rod structure further comprises a first locking member and a second locking member, wherein the first locking member and the second locking member are both provided with a rod portion and a cap portion; The rod portion of the first locking member is locked to the second extension member, and the first end of the second connecting member is rotatably sleeved on the rod portion of the first locking member and is limited between the cap portion of the first locking member and the second extension tube; The rod portion of the second locking member is locked to the fixing member, and the second end of the second connecting member is rotatably sleeved on the rod portion of the second locking member and is limited between the cap portion of the second locking member and the fixing member.
6. The abdominal muscle training device according to claim 5, characterized in that: The second connecting member includes a connecting rod and two rotating members, the rotating member includes a fixed part and a rotating part, and the rotating part is rotatably arranged in the fixed part; The fixed parts of the two rotating members are respectively connected to the two ends of the connecting rod, and the rotating parts of the two rotating members are respectively rotatably sleeved on the rod part of the first locking member and the rod part of the second locking member.
7. The abdominal muscle training device according to claim 6, characterized in that: The fixing part comprises a main body and a rod body connected to each other, two ends of the connecting rod are provided with internal threads, the rod body is provided with external threads, the rod body is screwed to the connecting rod, and the rotating part is rotatably arranged in the main body.
8. The abdominal muscle training device according to claim 1, characterized in that: The utility model also comprises a footrest member, wherein the footrest member is arranged at the front side of the seat cushion, and the position of the footrest member is higher than the seat cushion.
9. The abdominal muscle training device according to claim 8, characterized in that: The footrest members are provided in a plurality of groups, and the plurality of groups of footrest members are arranged at different height positions.
10. The abdominal muscle training device according to claim 1, characterized in that: The extension frame is provided with a hanging rod, and the hanging rod is used for hanging a barbell plate.