CN113058216B

CN113058216B - Physical training auxiliary device

Info

Publication number: CN113058216B
Application number: CN202110335829.7A
Authority: CN
Inventors: 陈治强
Original assignee: Ankang University
Current assignee: Cangzhou Jishuo Sports Equipment Co ltd; Hefei Longzhi Electromechanical Technology Co ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2021-11-16
Anticipated expiration: 2041-03-29
Also published as: CN113058216A

Abstract

The invention relates to the technical field of physical fitness equipment, and particularly provides a physical exercise auxiliary device which mainly comprises a frame body, a supporting seat, a chair back, an arc-shaped elastic part, a foot supporting part and the like, wherein the supporting seat is fixedly connected with the frame body through a column body; the left end of seat lower surface is articulated mutually with the support body, back of the chair lower extreme with the support body is articulated mutually, and seat lower surface, back of the chair rear surface all pass through the tip sliding connection that spout, slider and arc elastic component correspond, and foot's support piece includes the supporting rod, the right-hand member of supporting rod with support body fixed connection, the left end of supporting rod is fixed with the backup pad of foot, is equipped with the spacing ring of foot in the backup pad of foot. The invention has simple structure and convenient use and operation, and the apparatus can be used as an office chair and also can be used for sit-up exercise, in particular for the adaptation and the strengthening training at the initial stage of the sit-up exercise.

Description

Physical training auxiliary device

Technical Field

The invention relates to the technical field of physical fitness equipment, in particular to a physical exercise auxiliary device.

Background

Modern society, because many people work and sit in the office, sit for a long time and lack the motion, can lead to belly fat to pile up, form belly, look very unattractive and be unfavorable for healthy in the physique, sit up is the exercise mode that uses most often among the daily body building exercise, increase waist and abdomen muscle strength that can be fine, eliminate the unnecessary fat in belly, however to most people, especially the comparatively obese person of belly, when just beginning to take exercise through sit up, because waist and abdomen muscle strength is weak, often lie down the back in-process because nobody holds up, then comparatively labouring, and when sit up, also often struggle the action of accomplishing to sit up that is difficult to fine when the upper part of the body is upwards, especially the initial stage of sitting up, it is more obvious difficult, can't accomplish whole set of sit up action very well. In view of this, an auxiliary exercise device for sit-ups is needed, which can help people to perform sit-ups training well, so as to exercise the strength of waist and abdomen muscles and shape beautiful body types.

Disclosure of Invention

The present invention has been made to overcome the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a physical exercise assisting device which enables people to perform an initial adaptation and a later intensive training of a sit-up exercise well.

The technical scheme of the invention is as follows: a physical exercise aid comprising:

a frame body;

the supporting seat is fixedly connected with the frame body through a column;

the left end of the lower surface of the chair seat is hinged with the frame body, the lower surface of the chair seat is also provided with a first sliding chute along the left-right direction, and a first sliding block is connected in the first sliding chute in a sliding manner;

the lower end of the chair back is hinged with the frame body, a second sliding groove is formed in the back surface of the chair back along the longitudinal direction of the chair back, and a second sliding block is connected in the second sliding groove in a sliding mode;

the arc-shaped elastic part comprises a fixed arc-shaped cylinder, the fixed arc-shaped cylinder is fixed on the frame body, the convex side of the fixed arc-shaped cylinder faces downwards, a first movable arc-shaped cylinder is sleeved at the left end of the fixed arc-shaped cylinder, and a second movable arc-shaped cylinder is sleeved at the right end of the fixed arc-shaped cylinder; the left end head of the first movable arc-shaped cylinder is fixedly connected with the first sliding block, and the right end head of the second movable arc-shaped cylinder is fixedly connected with the second sliding block; a spring penetrates through the first movable arc-shaped cylinder, the fixed arc-shaped cylinder and the second movable arc-shaped cylinder, wherein the left end of the spring is connected with the left end inside the first movable arc-shaped cylinder, and the right end of the spring is connected with the right end inside the second movable arc-shaped cylinder;

the foot supporting piece comprises a supporting connecting rod, the right end of the supporting connecting rod is fixedly connected with the frame body, a foot supporting plate is fixed at the left end of the supporting connecting rod, and a foot limiting ring is arranged on the foot supporting plate.

The frame body is respectively fixed with a first limiting block and a second limiting block, the first limiting block is arranged below the chair seat and used for limiting the right end of the chair seat to be lower than the left end of the chair seat; the second limiting block is arranged at the position below the chair back when the chair back rotates to the horizontal state and is used for limiting the upper end of the chair back to be lower than the lower end of the chair back in the process of being placed to be horizontal, so that the chair back can only reach the horizontal state at the lowest level in the process of being placed flat, and finally reaches the state of being laid flat and starting to sit up when doing sit-up exercise.

The number of the support connecting rods is 2, the foot supporting plates are fixedly connected with the support connecting rods simultaneously, the support connecting rods are respectively connected with the support connecting rod containing cavities in a sliding mode and can be contained in the support connecting rod containing cavities in a sliding mode, so that the physical exercise assisting device can be used as a chair, and the support connecting rods are telescopic rod structures with adjustable lengths, so that the support connecting rod containing cavities can be smaller and are convenient to contain; the second limiting block is arranged on the longitudinal rod body with the adjustable length, the lower end of the longitudinal rod body is fixed on the frame body, and when the chair back rotates anticlockwise around a hinge point where the chair back is hinged with the frame body, so that the chair back faces a vertical state, the second limiting block has a limiting function of preventing the chair back from inclining backwards by adjusting the length of the longitudinal rod body, and the physical exercise auxiliary device can stably lean against the chair back when being used as a chair; in addition, the limit of the rotation angle of the chair back can be realized by finely adjusting the longitudinal rod body.

The upper end of the chair back is provided with a holding part, the chair back is of a telescopic structure with adjustable length in the longitudinal direction, the chair back comprises an upper plate body and a lower plate body, the upper plate body is of a hollow structure, the lower end of the upper plate body is provided with an inlet leading to the interior of the upper plate body, the upper end of the lower plate body is inserted into the upper plate body from the inlet and is in sliding connection with the upper plate body, the lower end of the lower plate body is hinged with the frame body, and a locking bolt for locking the relative positions of the upper plate body and the lower plate body is arranged between the upper plate body and the lower plate body; the holding part is arranged on the upper plate body. When doing sit-up exercise, the length of the chair back can be lengthened by pulling the upper plate body and the lower plate body of the chair back apart along the longitudinal direction of the chair back, so that the position of the holding part is adjusted upwards, and the distance between the hand part and the hip part is increased, so that greater waist and abdomen force is required to be applied during sit-up exercise, and the aim of increasing the exercise difficulty is fulfilled; when contracting the back of the chair to the shortest, accomodate simultaneously behind the support link, can make the training person lie prone to the seat and the back of the chair is in the whole face of horizontality simultaneously, thereby make the training person can lie prone and lean up the training, can temper back muscle groups such as sacrospinalis, wherein be equipped with between the back of the chair and the support body and make the back of the chair be in the first locking mechanism of horizontality all the time, simultaneously because the back of the chair can the adaptability paste human body from top to bottom under the state of first locking mechanism quilt unblock, then can play the purpose of supplementary exercise sacrospinalis.

The frame body is further fixed with a mechanical counter at the lower end of the chair back, the counting trigger end of the mechanical counter is in contact with the lower end edge of the chair back, and the counting mechanism is used for erecting the chair back once to trigger counting when doing sit-ups.

The number of the first sliding grooves, the second sliding grooves and the arc-shaped elastic pieces is 2, and each arc-shaped elastic piece is connected with the corresponding sliding groove in a sliding mode through a first sliding block and a second sliding block.

The spring is divided into two sections from the middle part of the spring, the arc-shaped rod with adjustable length is connected between the two sections of springs, the arc-shaped rod comprises an arc-shaped sleeve and an arc-shaped rod body sleeved in the arc-shaped sleeve, the arc-shaped sleeve and the arc-shaped rod body are connected with the corresponding spring sections, a second locking mechanism used for locking the relative position between the arc-shaped sleeve and the arc-shaped rod body is arranged between the arc-shaped sleeve and the arc-shaped rod body, the second locking mechanism penetrates out of a slot which is longitudinally formed in the fixed arc-shaped cylinder along the fixed arc-shaped cylinder, so that the length of the arc-shaped rod is adjusted to conveniently adjust the elastic strength of the spring, and the right end of the arc-shaped rod body is further fixed with an adjusting handle which penetrates out of the slot.

The column body is a liftable column body with adjustable length; the supporting seat lower extreme is equipped with a plurality of gyro wheels.

The invention has the beneficial effects that: the invention provides a physical exercise auxiliary device, which can adapt to and strengthen the training of sit-ups for people who have difficulty in sit-ups exercise, when the device is used, an exerciser sits on a chair surface, and inserts two feet into a foot limiting ring of a foot supporting piece, when the exerciser sits on the chair surface, under the combined action of the weight of the exerciser and the upward elastic support of the left end of an arc-shaped elastic piece, the chair surface can become horizontal and is finally supported by a first supporting block below the chair surface, meanwhile, the right end of the arc-shaped elastic piece can push a chair back to the back direction of the exerciser under the action of a spring, so that the exerciser leans against the chair back when leaning backwards for about half, and the exerciser can not be difficult to lie down under the action of the auxiliary elastic support of the chair back, when the exerciser lies down, the hand holding part is grasped by the two hands, then the sit-up exercise is carried out, the chair back can be driven by the body to move upwards simultaneously when the chair is sit up, the sit-up exercise is convenient under the action of the elastic force of the arc-shaped elastic part, and the spring in the elastic force of the arc-shaped elastic part is changed into the stretching state from the compression state when the chair is sit up to midway, so the upward elastic force is not applied to the chair back any more, therefore, the whole sit-up exercise is to be continuously completed, the exerciser needs to tightly hold the hand holding part by the two hands to continuously sit up with strength, the tension of the spring can be overcome, the final sitting straight to complete the whole sit-up action, therefore, the support of the chair back by the arc-shaped elastic part of the invention can form good auxiliary action on the exerciser in the initial lying-down stage and the sitting-up stage, and the spring acts on the chair back when the chair is quickly sit-up by the tension of the sit-up exercise, the invention can strengthen the exercise intensity of the waist during the sit-up, thereby realizing the strengthened training during the sit-up, and certainly, when the spring changes the thrust to the chair back from the thrust to the pulling force during the sit-up, the hands of the exerciser can release the holding part and hold the head to carry out the normal sit-up exercise without using the strengthened training function. The sit-up training device is simple in structure and convenient to use and operate, and can well help people to complete the adaptation and the strengthening training at the initial stage of sit-up exercise.

Drawings

FIG. 1 is a schematic view of the overall structure of the apparatus of the present invention;

FIG. 2 is a schematic view of the connection structure of the backrest and the arc-shaped elastic member of the present invention;

fig. 3 is a schematic view of the structure of the present invention at the location of the curved bar.

Detailed Description

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the embodiment.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing technical solutions of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1 to 3, the present invention provides a physical exercise assisting device, which includes a frame body 7, a support base 8, a seat 11, a seat back 1, an arc-shaped elastic member, a foot supporting member, and the like. The supporting seat 8 is fixedly connected with the frame body 7 through a column 18; the left end of the lower surface of the seat 11 is hinged with the frame body 7, the lower surface is also provided with a first sliding chute 12 along the left-right direction, and a first sliding block 13 is connected in the first sliding chute 12 in a sliding manner; the lower end of the chair back 1 is hinged with the frame body 7, a second sliding groove 1-1 is formed in the rear surface of the chair back 1 along the longitudinal direction of the chair back 1, and a second sliding block 2 is connected in the second sliding groove 1-1 in a sliding manner; the arc-shaped elastic part comprises a fixed arc-shaped cylinder 5, the fixed arc-shaped cylinder 5 is fixed on the frame body 7, the convex side of the fixed arc-shaped cylinder 5 is downward, the left end of the fixed arc-shaped cylinder 5 is sleeved with a first movable arc-shaped cylinder 6, and the right end of the fixed arc-shaped cylinder 5 is sleeved with a second movable arc-shaped cylinder 3; the left end of the first movable arc-shaped cylinder 6 is fixedly connected with the first sliding block 13, and the right end of the second movable arc-shaped cylinder 3 is fixedly connected with the second sliding block 2; a spring 4 penetrates through the first movable arc-shaped cylinder 6, the fixed arc-shaped cylinder 5 and the second movable arc-shaped cylinder 3, wherein the left end of the spring 4 is connected with the left end of the inside of the first movable arc-shaped cylinder 6, and the right end of the spring 4 is connected with the right end of the inside of the second movable arc-shaped cylinder 3; the foot supporting part comprises a supporting connecting rod 14, the right end of the supporting connecting rod 14 is fixedly connected with the frame body 7, a foot supporting plate 19 is fixed at the left end of the supporting connecting rod 14, and a foot limiting ring 15 is arranged on the foot supporting plate 19.

Further, a first limiting block 10 and a second limiting block 9 are respectively fixed on the frame body 7, and the first limiting block 10 is arranged below the seat 11 and used for limiting the right end of the seat 11 to be lower than the left end thereof; the second limiting block 9 is arranged at the lower position of the chair back when the chair back 1 rotates to the horizontal state and is used for limiting the upper end of the chair back 1 to be lower than the lower end of the chair back in the process of being placed to be horizontal, so that the chair back can only reach the horizontal state at the lowest position in the process of being placed flat, and finally reaches the state of lying flat and starting to sit up when doing sit-up exercise.

Furthermore, the number of the support connecting rods 14 is 2, the foot supporting plate 19 is fixedly connected with each support connecting rod 14 at the same time, each support connecting rod 14 is connected with the support connecting rod accommodating cavity 21 in a sliding manner and can be accommodated into the support connecting rod accommodating cavity 21 in a sliding manner, so that the physical exercise assisting device can be used as a chair, and each support connecting rod 14 is of a telescopic rod structure with adjustable length, so that the support connecting rod accommodating cavity 21 can be made smaller and is convenient to accommodate; as shown in fig. 1 in detail, the second limiting block 9 is disposed on a longitudinal rod 20 with adjustable length, the lower end of the longitudinal rod 20 is fixed on the frame body 7, when the seat back 1 rotates counterclockwise around a hinge point where the seat back 1 is hinged to the frame body 7, so that the seat back 1 faces a vertical state, the second limiting block 9 forms a limiting function for preventing the seat back 1 from tilting backward by adjusting the length of the longitudinal rod 20, and when the physical training assisting device is used as a chair, the second limiting block 9 can stably abut against the seat back 1; in addition, the rotation angle of the chair back 1 can be limited by finely adjusting the longitudinal rod body 20.

Further, referring to fig. 1 and 2, a holding portion 16 is arranged at the upper end of a chair back 1, the chair back 1 has a length-adjustable telescopic structure in the longitudinal direction thereof, the chair back 1 comprises an upper plate body 1-2 and a lower plate body 1-3, wherein the upper plate body 1-2 is a hollow structure, an inlet leading to the inside of the upper plate body 1-2 is formed at the lower end of the upper plate body 1-2, the upper end of the lower plate body 1-3 is inserted into the upper plate body 1-2 from the inlet and is slidably connected with the upper plate body 1-2, the lower end of the lower plate body 1-3 is hinged to the frame body 7, and a locking bolt 1-4 for locking the relative position of the upper plate body 1-2 and the lower plate body 1-3 is arranged between the upper plate body 1-2 and the lower plate body 1-3; the holding part 16 is arranged on the upper plate body 1-2. When doing sit-up exercise, the length of the chair back 1 can be lengthened by pulling the upper plate body 1-2 and the lower plate body 1-3 of the chair back 1 along the longitudinal direction of the chair back 1, so that the position of the hand holding part 16 is adjusted upwards, and the distance between the hand and the hip is increased, so that greater waist and abdomen force is required to be applied during sit-up exercise, and the aim of increasing the exercise difficulty is fulfilled; when contracting back of the chair 1 to the shortest, accomodate simultaneously behind the support link 14, can make the training person lie prone to chair face 11 and back of the chair 1 simultaneously on the whole face that is in the horizontality, thereby make the training person can lie prone and lean up the training, can temper back muscle groups such as sacrospinalis, wherein be equipped with between back of the chair and the support body and make the back of the chair be in the first locking mechanism of horizontality all the time, simultaneously because the back of the chair can the adaptability paste human body from top to bottom under the state of first locking mechanism quilt unblock, then can play the purpose of supplementary exercise sacrospinalis.

Further, lie in 1 lower extreme department of the back of the chair on the support body 7 and still be fixed with mechanical type counter 22, mechanical type counter 22's count trigger end contacts with the lower extreme edge of the back of the chair 1 for erect back of the chair 1 when doing the sit up and once carry out the count that triggers, can realize the automatic counting of sit up number of times.

Further, the quantity of first spout 12, second spout 1-1 and arc elastic component is 2, and each arc elastic component all through a first slider 13, second slider 2 and the spout sliding connection that corresponds, can be through the stable rising and falling of the realization back of the chair that realizes in the sit up exercise of 2 group's spouts and arc elastic component's structure.

Further, referring to fig. 3, the spring 4 is divided into two segments from the middle, an arc rod 23 with adjustable length is connected between the two segments of spring 4, the arc rod 23 includes an arc sleeve 23-1 and an arc rod body 23-2 sleeved in the arc sleeve, the arc sleeve 23-1 and the arc rod body 23-2 are both connected with the corresponding spring segment, a second locking mechanism 25 for locking the relative position between the arc sleeve 23-1 and the arc rod body 23-2 is arranged between the arc sleeve 23-1 and the arc rod body 23-2, the second locking mechanism 25 is specifically a locking bolt, the locking bolt penetrates through a slot 24 longitudinally formed on the fixed arc cylinder 5 along the fixed arc cylinder 5, so as to adjust the length of the arc rod 23, so as to conveniently adjust the elastic strength of the spring 4, and better adapt to the exercise requirements of different exercisers and different exercise stages, wherein the right-hand member of the arc-shaped rod body 23-2 still is fixed with the adjustment handle 26 of wearing out the seam groove 24, through the length of the regulation arc-shaped rod that the horizontal slip of handle 26 can be convenient, after adjusting suitable length, can lock the length of arc-shaped rod through screwing up the locking bolt to the elasticity intensity of locking spring.

Furthermore, the column 18 is a lifting column with adjustable length, and the height of the whole device can be adjusted according to different exercisers; the supporting seat 8 lower extreme is equipped with a plurality of gyro wheels, makes things convenient for the removal of whole device.

In summary, the present invention provides a physical exercise assisting device, which can adapt to and enhance the training of a sit-up for a person who has difficulty in the sit-up exercise, wherein when the device is used, an exerciser sits on a seat, inserts feet into a foot position-limiting ring of a foot support member, when the exerciser sits on the seat, under the combined action of the weight of the exerciser and the left end of an arc-shaped elastic member supported upwards and elastically, the seat becomes horizontal and is finally supported by a first supporting block below the seat, and at the same time, the right end of the arc-shaped elastic member pushes a chair back towards the back of the exerciser under the action of a spring, so that the exerciser leans against the chair back when leaning backwards for about half, and as the exerciser continues to lie downwards, the exerciser can not be difficult to lie flat under the action of the back auxiliary elastic support, and when the exerciser lies flat, the hand holding part is grasped by the two hands, then the sit-up exercise is carried out, the chair back can be driven by the body to move upwards simultaneously when the chair is sit up, the sit-up exercise is convenient under the action of the elastic force of the arc-shaped elastic part, the spring in the elastic force of the arc-shaped elastic part is changed into the stretching state from the compression state when the chair is sit up to midway, so the upward elastic force is not applied to the chair back any more, at the moment, the whole sit-up is to be continuously completed, the exerciser needs to tightly hold the hand holding part by the two hands to continuously sit up with strength, the tension of the spring can be overcome, the final sitting straight to complete the whole sit-up action, therefore, the support of the chair back by the arc-shaped elastic part of the invention can form good auxiliary action on the exerciser in the initial lying down stage and the sitting up stage, and the spring acts on the chair back when the chair is quickly sit up by the tension of the sit-up exercise, the invention can strengthen the exercise intensity of the waist during the sit-up, thereby realizing the strengthened training during the sit-up, and certainly, the invention can also release the hand holding part and hold the head to perform the sit-up exercise without using the strengthened training function when the spring changes the thrust to the chair back from the thrust to the pulling force during the sit-up. The sit-up training device is simple in structure and convenient to use and operate, and can well help people to complete the adaptation and the strengthening training at the initial stage of sit-up exercise.

The above disclosure is only for a few specific embodiments of the present invention, however, the present invention is not limited to the above embodiments, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.

Claims

1. A physical exercise aid comprising:

a frame body (7);

the supporting seat (8) is fixedly connected with the frame body (7) through a column body (18);

the left end of the lower surface of the chair seat (11) is hinged with the frame body (7), the lower surface is also provided with a first sliding chute (12) along the left-right direction, and a first sliding block (13) is connected in the first sliding chute (12) in a sliding manner;

the lower end of the chair back (1) is hinged with the frame body (7), a second sliding groove (1-1) is formed in the rear surface of the chair back (1) along the longitudinal direction of the chair back (1), and a second sliding block (2) is connected in the second sliding groove (1-1) in a sliding manner;

the arc-shaped elastic part comprises a fixed arc-shaped cylinder (5), the fixed arc-shaped cylinder (5) is fixed on the frame body (7), the convex side of the fixed arc-shaped cylinder (5) faces downwards, a first movable arc-shaped cylinder (6) is sleeved at the left end of the fixed arc-shaped cylinder (5), and a second movable arc-shaped cylinder (3) is sleeved at the right end of the fixed arc-shaped cylinder (5); the left end of the first movable arc-shaped cylinder (6) is fixedly connected with the first sliding block (13), and the right end of the second movable arc-shaped cylinder (3) is fixedly connected with the second sliding block (2); a spring (4) penetrates through the first movable arc-shaped cylinder (6), the fixed arc-shaped cylinder (5) and the second movable arc-shaped cylinder (3), wherein the left end of the spring (4) is connected with the left end of the interior of the first movable arc-shaped cylinder (6), and the right end of the spring (4) is connected with the right end of the interior of the second movable arc-shaped cylinder (3);

foot support piece, including support connecting rod (14), the right-hand member of support connecting rod (14) with support body (7) fixed connection, the left end of support connecting rod (14) is fixed with foot backup pad (19), is equipped with foot spacing ring (15) on foot backup pad (19).

2. The physical exercise assisting device of claim 1, wherein a first limiting block (10) and a second limiting block (9) are respectively fixed on the frame body (7), the first limiting block (10) is arranged below the seat surface (11) and used for limiting the right end of the seat surface (11) to be lower than the left end thereof; the second limiting block (9) is arranged at the lower position of the chair back when the chair back (1) rotates to the horizontal state and is used for limiting the upper end of the chair back (1) to be lower than the lower end of the chair back in the horizontal process.

3. An exercise aid according to claim 2 wherein the number of support links (14) is 2, the foot support plate (19) is fixedly connected to each support link (14) simultaneously, each support link (14) is slidably connected to a support link receiving cavity (21) and can be received by sliding in the support link receiving cavity (21) to use the exercise aid as a chair, and each support link (14) is a telescopic rod structure of adjustable length to allow the support link receiving cavity (21) to be made smaller for easy storage; the second limiting block (9) is arranged on the longitudinal rod body (20) with the adjustable length, the lower end of the longitudinal rod body (20) is fixed on the frame body (7), when the chair back (1) rotates anticlockwise around a hinge point where the chair back and the frame body (7) are hinged, so that the chair back (1) faces to a vertical state, the second limiting block (9) can form a limiting function of avoiding the chair back (1) from inclining backwards by adjusting the length of the longitudinal rod body (20), and the physical exercise auxiliary device can stably lean against the chair back (1) when being used as a chair; in addition, the rotation angle of the chair back (1) can be limited by finely adjusting the longitudinal rod body (20).

4. A physical exercise aid according to claim 2 wherein the upper end of the backrest (1) is provided with a hand grip (16), the chair back (1) is of a telescopic structure with adjustable length in the longitudinal direction, the chair back (1) comprises an upper plate body (1-2) and a lower plate body (1-3), wherein the upper plate body (1-2) is of a hollow structure, the lower end of the upper plate body (1-2) is provided with an inlet leading to the interior of the upper plate body (1-2), the upper end of the lower plate body (1-3) is inserted into the upper plate body (1-2) from the inlet and is connected with the upper plate body (1-2) in a sliding way, the lower end of the lower plate body (1-3) is hinged with the frame body (7), a locking bolt (1-4) for locking the relative position of the upper plate body (1-2) and the lower plate body (1-3) is arranged between the upper plate body and the lower plate body; the hand holding part (16) is arranged on the upper plate body (1-2); when doing sit-ups exercise, the length of the chair back (1) can be lengthened by pulling the upper plate body (1-2) and the lower plate body (1-3) of the chair back (1) apart longitudinally along the chair back (1), so that the position of the hand holding part (16) is adjusted upwards, and as the distance between the hand and the hip is increased, a larger waist and abdomen force is required to be applied during sit-ups exercise, and the purpose of increasing the exercise difficulty is achieved; when contracting back of the chair (1) to the shortest, accomodate simultaneously and support connecting rod (14) back, can make the training person lie prone to chair face (11) and back of the chair (1) and be in the whole face of horizontality simultaneously on to make the training person can carry out the training of straightening one's body of lying prone, can temper back muscle groups such as sacrospinalis, because back of the chair (1) can the adaptability paste the human body from top to bottom, then can play the purpose of supplementary exercise sacrospinalis simultaneously.

5. A physical exercise aid according to claim 1 wherein a mechanical counter (22) is further secured to the frame (7) at the lower end of the back (1), the count trigger end of the mechanical counter (22) being in contact with the lower end edge of the back (1) for triggering the count of one erection of the back (1) during the sit-up.

6. A physical exercise aid according to claim 1 wherein the number of the first runner (12), second runner (1-1) and arcuate resilient member is 2 and each arcuate resilient member is slidably connected to the respective runner by a first slider (13) and second slider (2).

7. The physical exercise assisting device of claim 1, wherein the spring (4) is divided into two segments from the middle part thereof, a length-adjustable arc rod (23) is connected between the two segments of the spring (4), the arc rod (23) comprises an arc sleeve (23-1) and an arc rod body (23-2) sleeved in the arc sleeve, the arc sleeve (23-1) and the arc rod body (23-2) are both connected with the corresponding segments of the spring (4), a second locking mechanism (25) for locking the relative position between the arc sleeve and the arc rod body is arranged between the arc sleeve and the arc rod body, the second locking mechanism (25) penetrates out of a slot (24) which is longitudinally arranged on the fixed arc tube (5) along the fixed arc tube (5), so as to conveniently adjust the length of the arc rod (23) and conveniently realize the adjustment of the elastic strength of the spring (4), wherein the right end of the arc-shaped rod body (23-2) is also fixed with an adjusting handle (26) which penetrates out of the slot (24).

8. A physical exercise aid according to claim 1 wherein the column (18) is a liftable column of adjustable length; the lower end of the supporting seat (8) is provided with a plurality of rollers.