Motion system

Abstract

The present disclosure provides a movement system. The movement system includes a foot-plate exercise machine and a chair. The foot-plate exercise machine implements repetitive lower limb movement accompanied by extension and flexion of at least a knee joint and a hip joint. The chair is a component for a user to sit on while the user uses the foot-plate exercise machine to perform the lower limb movement. The chair has a seating portion for the user to sit on, and a support mechanism that supports the seating portion in a manner that allows the seating portion to rock laterally. By the seating portion rocking laterally during the lower limb movement, a movement chain of the lower limb and the torso is generated.

Description

TECHNICAL FIELD

[0001] The present application relates to a movement system that realizes a kinetic chain of lower limbs and a trunk. BACKGROUND

[0002] Patent Document 1 (Japanese Patent Application Publication No. 10-94577) discloses an exercise machine that pedals a pedal on a seat. SUMMARY

[0003] Problem to be Solved by the Invention

[0004] In the structure of Patent Document 1, when performing a foot exercise on a seat, not only the lower limbs but also the trunk are intended to be exercised. However, in the structure of Patent Document 1, the lower limbs and the trunk cannot be exercised simultaneously.

[0005] An object of the present application is to provide a technology that realizes a kinetic chain of lower limbs and a trunk when performing a lower limb exercise in a seated posture.

[0006] Method for Solving the Problem

[0007] According to a first aspect of the present disclosure, there is provided a movement system including: a lower limb exercise machine that realizes a lower limb exercise that is repeatedly accompanied by extension and flexion of at least a knee joint and a hip joint; and a chair on which a user sits when the user performs the lower limb exercise using the lower limb exercise machine, in the movement system, the chair includes: a seating portion on which the user sits; and a support mechanism that supports the seating portion so as to be able to swing in a tilting manner, and a kinetic chain of lower limbs and a trunk is generated by the seating portion swinging in a tilting manner when the lower limb exercise is performed. According to the above structure, a kinetic chain of lower limbs and a trunk can be realized when a lower limb exercise is performed in a seated posture.

[0008] According to a second aspect of the present disclosure, there is provided a movement system including: a lower limb exercise machine that realizes a lower limb exercise that is repeatedly accompanied by extension and flexion of at least a knee joint and a hip joint; and a movement assisting tool that can be mounted on a seat surface of a chair and on which a user sits when the user performs the lower limb exercise using the lower limb exercise machine, in the movement system, the movement assisting tool includes: a seating portion on which the user sits; and a support mechanism that supports the seating portion so as to be able to swing in a tilting manner, and a kinetic chain of lower limbs and a trunk is generated by the seating portion swinging in a tilting manner when the lower limb exercise is performed. According to the above structure, a kinetic chain of lower limbs and a trunk can be realized when a lower limb exercise is performed in a seated posture.

[0009] The support mechanism can also include a right leg elastic body disposed below the seat portion and corresponding to the right ischium of the user seated on the seat portion, and a left leg elastic body disposed below the seat portion and corresponding to the left ischium of the user seated on the seat portion. According to the above structure, the support mechanism can be implemented with a simple structure.

[0010] The right leg elastic body and the left leg elastic body can also be pockets into which gas is enclosed. According to the above structure, the movement system can be implemented inexpensively.

[0011] The pockets can also be semispherical in shape that protrude downward in a state in which the gas is enclosed. According to the above structure, effective roll can be achieved.

[0012] The right leg elastic body and the left leg elastic body can also be coil springs. According to the above structure, the right leg elastic body and the left leg elastic body can be implemented inexpensively.

[0013] The support mechanism can also correct the pitch of the pelvis of the user. According to the above structure, the movement chain described above can be effectively generated.

[0014] The support mechanism can also include a coccyx elastic body disposed below the seat portion and corresponding to the coccyx of the user seated on the seat portion, and correct the pitch of the pelvis of the user by the coccyx elastic body. According to the above structure, the support mechanism can be implemented with a simple structure.

[0015] The coccyx elastic body can also be a pocket into which gas is enclosed, or a coil spring. According to the above structure, the coccyx elastic body can be implemented inexpensively.

[0016] Effects of the Invention

[0017] According to the present disclosure, a movement chain of the lower limbs and the torso can be achieved when the lower limbs are moved in a seated position.

[0018] The above and other objects, features and advantages of the present disclosure will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, which are to be considered illustrative only, and not to be considered as limiting the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A diagram showing a case in which a user directly uses a leg exerciser on a seat to move the lower limbs. (First Embodiment)

[0020] Figure 2 is a perspective view of a chair. (First embodiment)

[0021] Figure 3 is a front cross-sectional view of a chair. (First embodiment)

[0022] Figure 4 is a plan view of a pelvis. (First embodiment)

[0023] Figure 5 is a perspective view of a chair. (Second embodiment)

[0024] Figure 6 is a front cross-sectional view of a chair. (Second embodiment)

[0025] Figure 7 is a front view of a bellows-type balloon. (Modified example)

[0026] Figure 8 is a front view of a coil spring. (Modified example) DETAILED DESCRIPTION

[0027] (First embodiment)

[0028] Hereinafter, a first embodiment of the present disclosure will be described with reference to Figures 1 to 4 , a first embodiment of the present disclosure will be described.

[0029] In Figure 1 , a movement system 100 is shown. As shown in Figure 1 , a user U performs lower limb movement using a foot-pedal exercise machine 2 while sitting on a chair 1.

[0030] The foot-pedal exercise machine 2 is one specific example of a lower limb exercise machine that realizes lower limb movement that repeatedly accompanies extension and flexion of the knee joint and the hip joint, and the ankle joint. The foot-pedal exercise machine 2 includes a machine body 3, a pair of cranks 4, and a pair of pedals 5. The pair of pedals 5 are respectively provided on the pair of cranks 4 in a manner that is free to pivot in a pitch direction. The pair of cranks 4 are provided by the machine body 3 in a manner that is free to pivot in the pitch direction. The user U places both feet F on the pair of pedals 5 while sitting on the chair 1, and performs so-called foot-pedal movement by alternately stepping out with the right foot RL and the left foot LL. At this time, extension and flexion of the knee joint, the hip joint, and the ankle joint of the right foot RL and the left foot LL are repeatedly performed. Typically, the knee joint of the left foot LL is flexed while the knee joint of the right foot RL is extended. The hip joint of the left foot LL is flexed while the hip joint of the right foot RL is extended. The ankle joint of the left foot LL is flexed while the ankle joint of the right foot RL is extended. Thus, the pair of pedals 5 rotate around the crank shaft 4a in opposite phases to each other. That is, the foot-pedal exercise machine 2 realizes lower limb movement in which both feet F trace a circular trajectory with the crank shaft 4a as the center.

[0031] In addition, the foot exercise machine 2 is nothing but an example of a lower limb exercise machine. That is, the lower limb exercise machine is not limited to the foot exercise machine 2. The lower limb exercise machine can also be a machine that realizes lower limb exercise in which both feet F are moved in parallel with respect to the floor surface while the user U is seated on the chair 1.

[0032] In Figure 2 , a perspective view of the chair 1 is shown. As shown in Figure 2 , the chair 1 has a chair body 6 and a plurality of legs 7. The chair body 6 is supported by the plurality of legs 7.

[0033] In Figure 3 , a front cross-sectional view of the chair 1 is shown. As shown in Figure 3 , the chair body 6 includes a seating portion 10, a support mechanism 11 that supports the seating portion 10, and a cover 12. The support mechanism 11 is disposed inferior to the seating portion 10. That is, the seating portion 10 is disposed superior to the support mechanism 11.

[0034] The seating portion 10 is a portion in which the user U is seated. The seating portion 10 has a seat surface 10a that faces upward and a lower surface 10b that faces downward. As shown in Figure 2 and Figure 3 , the seat surface 10a is slightly inclined in a manner that becomes higher toward the posterior. The seating portion 10 is composed of a soft raw material that is suitable for dispersing pressure between the user U and the seating portion 10 when the user U is seated. Typically, the seating portion 10 is a continuous cell structure represented by polyurethane foam or an independent cell structure represented by polyethylene foam or rubber sponge.

[0035] In the seating portion 10, a recess for relatively positioning the pelvis of the user U seated on the seating portion 10 with respect to the seating portion 10 can also be formed. Typically, the recess is formed to receive the buttocks and the right and left thighs of the user. Instead of this, a line for indicating the position of the buttocks of the user U seated on the seating portion 10 can also be drawn on the seating portion 10. By adopting this, the desired positional relationship between the seating portion 10 and the pelvis of the user U can be realized.

[0036] The support mechanism 11 is a mechanism that supports the seating portion 10 in a manner that can tilt and can yaw. The support mechanism 11 includes a yawing mechanism 13 and a tilting mechanism 14. The tilting mechanism 14 is disposed superior to the yawing mechanism 13. However, instead of this, the tilting mechanism 14 can also be disposed inferior to the yawing mechanism 13. The yawing mechanism 13 can also be omitted.

[0037] The yawing mechanism 13 includes an upper support plate 13a arranged on the upper side, a lower support plate 13b arranged on the lower side, and a bearing 13c arranged between the upper support plate 13a and the lower support plate 13b. That is, the upper support plate 13a is arranged on the upper side of the bearing 13c, and the lower support plate 13b is arranged on the lower side of the bearing 13c. The plurality of legs 7 are fixed to the lower support plate 13b in a manner of protruding downward from the lower support plate 13b. The upper support plate 13a is rotatable with respect to the lower support plate 13b via the bearing 13c. In the present embodiment, the bearing 13c is a rolling bearing. However, instead of this, the bearing 13c can be a sliding bearing. The upper support plate 13a and the lower support plate 13b are plates having sufficient rigidity not to easily be deflected under a load received from the user U, and are, for example, wood, metal, or resin.

[0038] The rolling mechanism 14 includes an upper support plate 15 arranged on the upper side, and a plurality of balloons 16 arranged on the lower side. That is, the upper support plate 15 is arranged on the upper side of the plurality of balloons 16. The plurality of balloons 16 are arranged on the lower side of the upper support plate 15. The upper support plate 15 is a plate having sufficient rigidity not to easily be deflected under a load received from the user U, and is, for example, wood, metal, or resin. The upper support plate 15 is arranged on the lower surface 10b of the seating portion 10, thereby preventing the seating portion 10 from being deflected in a manner of protruding downward when the user U is seated on the seating portion 10.

[0039] Each balloon 16 is one specific example of an elastic body that generates a repulsive force toward the upper side when compressed in the vertical direction. Each balloon 16 is one specific example of a bag in which a gas is enclosed. That is, each balloon 16 is inflated by enclosing a gas at a predetermined pressure, thereby assuming a predetermined shape. In the present embodiment, each balloon 16 assumes a semispherical shape protruding downward in a state in which a gas is enclosed. Typically, each balloon 16 is made of polyvinyl chloride resin.

[0040] The plurality of balloons 16 include a right ischial balloon 16R, a left ischial balloon 16L, and a coccyx balloon 16T. The right ischial balloon 16R is one specific example of a right-side elastic body arranged on the lower side of the seating portion 10 and corresponding to the right-side ischium of the user U seated on the seating portion 10. The left ischial balloon 16L is one specific example of a left-side elastic body arranged on the lower side of the seating portion 10 and corresponding to the left-side ischium of the user U seated on the seating portion 10. The coccyx balloon 16T is one specific example of a coccyx elastic body arranged on the lower side of the seating portion 10 and corresponding to the coccyx of the user U seated on the seating portion 10.

[0041] In Figure 4 , a plan view of the pelvis of the user U when seated on the seat portion 10 is shown. The right ischial bulb 16R is correspondingly disposed with respect to the right lateral ischium of the user U when seated on the seat portion 10. The left ischial bulb 16L is correspondingly disposed with respect to the left lateral ischium of the user U when seated on the seat portion 10. The coccyx bulb 16T is correspondingly disposed with respect to the coccyx of the user U when seated on the seat portion 10.

[0042] More specifically, in Figure 4 the plan view shown, the distance Dl between the center of the right ischial bulb 16R and the center of the left ischial bulb 16L is longer than the distance D2 between the lower end of the right lateral ischium and the lower end of the left lateral ischium. That is, in Figure 4 the plan view shown, the right ischial bulb 16R is disposed slightly laterally outward from the lower end of the right lateral ischium. Likewise, the left ischial bulb 16L is disposed slightly laterally outward from the lower end of the left lateral ischium. According to this disposition, the repulsive force of the right ischial bulb 16R when the pelvis is tilted to the right side effectively pushes back the pelvis to tilt the pelvis to the left side. Likewise, the repulsive force of the left ischial bulb 16L when the pelvis is tilted to the left side effectively pushes back the pelvis to tilt the pelvis to the right side. Therefore, for the user U, the pelvis can be alternately tilted to the left and right sides rhythmically with less load. However, the right ischial bulb 16R can also be disposed directly below the lower end of the right lateral ischium, and the left ischial bulb 16L can also be disposed directly below the lower end of the left lateral ischium.

[0043] In this way, since the pelvis of the user U is tilted and rotated to the left and right sides when the user U is seated on the seat portion 10 and performs pedaling exercise using the pedaling exercise machine 2 by providing the right ischial bulb 16R and the left ischial bulb 16L, it is possible to cause the pelvis to generate an upward movement chain from the lower limbs to the trunk, and thus it is possible to exercise the trunk while exercising the lower limbs. That is, it is also possible to simultaneously achieve movement of the trunk muscles represented by the rectus abdominis muscle or transverse abdominis muscle, and erector spinae.

[0044] On the other hand, as shown in Figure 4 , the coccyx bulb 16T is disposed directly below the lower end of the coccyx. That is, the center 16Tc of the coccyx bulb 16T is located directly below the lower end of the coccyx. However, in Figure 4The center 16Tc of the coccyx balloon 16T can be disposed anterior to the lower end of the coccyx or posterior to the lower end of the coccyx in a plan view. Simply put, the coccyx balloon 16T can be disposed posterior to the right ischium balloon 16R and the left ischium balloon 16L. According to the above structure, the coccyx balloon 16T can support the seating portion 10 in a manner that stabilizes the pitch attitude of the seating portion 10.

[0045] In addition, in order to effectively generate the upward movement chain from the lower limbs to the trunk, it is important to set the pitch attitude of the pelvis to a slightly forward attitude. In this way, various methods can be considered to correct the pitch attitude of the pelvis. That is, for example, a first method in which the internal pressure of the coccyx balloon 16T is higher than the internal pressure of the right ischium balloon 16R and the left ischium balloon 16L. According to the above structure, when the user U sits on the seating portion 10, the pitch attitude is corrected because the sinking of the rear portion of the seating portion 10 is relatively suppressed due to the sinking of the front portion of the seating portion 10. A second method in which, as shown in FIG. 6, the seating portion 10 is formed in a manner that the seat surface 10a of the seating portion 10 is arched toward the rear. According to the above structure, the pitch attitude is corrected because the seat surface 10a itself is arched toward the rear. A combination of the first method and the second method is also a solution. Figure 2 As shown, the seating portion 10 is formed in a manner that the seat surface 10a of the seating portion 10 is arched toward the rear. According to the above structure, the pitch attitude is corrected because the seat surface 10a itself is arched toward the rear. A combination of the first method and the second method is also a solution.

[0046] Returning to Figure 3 The cover 12 is a member that covers the seating portion 10 and the support mechanism 11, and is typically cloth.

[0047] Although the first embodiment has been described above, the above first embodiment has the following features.

[0048] Figure 1 The exercise system 100 includes the pedal exercise machine 2 (lower limb exercise machine) and the chair 1. The pedal exercise machine 2 realizes repetitive lower limb movement accompanied by extension and flexion of at least the knee joint and the hip joint. The chair 1 is a member on which the user U sits when the user U uses the pedal exercise machine 2 to perform lower limb movement. As shown in FIG. 1, the chair 1 has a seating portion 10 on which the user U sits and a support mechanism 11 that supports the seating portion 10 in a manner that the seating portion 10 can swing laterally. By swinging the seating portion 10 laterally when the lower limb is moved, a movement chain of the lower limb and the trunk is generated. According to the above structure, the movement chain of the lower limb and the trunk can be realized when lower limb movement is performed in a seated attitude. Figure 3 As shown, the chair 1 has a seating portion 10 on which the user U sits and a support mechanism 11 that supports the seating portion 10 in a manner that the seating portion 10 can swing laterally. By swinging the seating portion 10 laterally when the lower limb is moved, a movement chain of the lower limb and the trunk is generated. According to the above structure, the movement chain of the lower limb and the trunk can be realized when lower limb movement is performed in a seated attitude.

[0049] As shown in FIG. 1, the chair 1 has a seating portion 10 on which the user U sits and a support mechanism 11 that supports the seating portion 10 in a manner that the seating portion 10 can swing laterally. By swinging the seating portion 10 laterally when the lower limb is moved, a movement chain of the lower limb and the trunk is generated. According to the above structure, the movement chain of the lower limb and the trunk can be realized when lower limb movement is performed in a seated attitude. Figure 3 and Figure 4As shown, the support mechanism 11 includes a right ischial balloon 16R (right leg-side elastic body) and a left ischial balloon 16L (left leg-side elastic body), wherein the right ischial balloon 16R is disposed below the seating portion 10 and corresponds to the ischium on the right leg side of the user U seated on the seating portion 10, and the left ischial balloon 16L is disposed below the seating portion 10 and corresponds to the ischium on the left leg side of the user U seated on the seating portion 10. According to the above structure, the support mechanism 11 can be implemented with a simple structure.

[0050] Further, the right ischial balloon 16R and the left ischial balloon 16L are bag bodies into which gas is enclosed. According to the above structure, the motion system 100 can be implemented inexpensively.

[0051] Further, as shown in Figure 3 the right ischial balloon 16R and the left ischial balloon 16L are hemispherical in shape that protrudes downward in a state of being enclosed with gas. According to the above structure, effective roll oscillation can be implemented.

[0052] Further, the support mechanism 11 also corrects the pitch attitude of the pelvis of the user U. According to the above structure, an upward movement chain from the lower limbs to the trunk can be effectively generated.

[0053] Further, as shown in Figure 3 the support mechanism 11 also includes a coccyx balloon 16T as a coccyx elastic body, which is disposed below the seating portion 10 and corresponds to the coccyx of the user U seated on the seating portion 10. With the coccyx balloon 16T, the pitch attitude of the pelvis of the user U is corrected. According to the above structure, the support mechanism 11 can be implemented with a simple structure.

[0054] Further, the coccyx balloon 16T as the coccyx elastic body is a bag body into which gas is enclosed. According to the above structure, the coccyx elastic body can be implemented inexpensively.

[0055] (Second Embodiment)

[0056] Next, the second embodiment will be described with reference to Figure 5 and Figure 6 Hereinafter, the points different from the above-described first embodiment will be described, and the overlapping description will be omitted.

[0057] In the above-described first embodiment, as shown in Figure 3 the chair 1 itself is provided with the seating portion 10 and the support mechanism 11.

[0058] In contrast, in the present embodiment, as shown in Figure 5 andFigure 6 As shown, the exercise assisting tool 21 that can be applied to the existing chair 20 is provided with the seating portion 10 and the support mechanism 11.

[0059] That is, the exercise assisting tool 21 is used by being mounted on the seat surface 20a of the chair 20. In detail, as shown in FIG. 1, the exercise assisting tool 21 is mounted on the seat surface 20a of the chair 20 in such a manner that the lower support plate 13b of the swing mechanism 13 of the support mechanism 11 of the exercise assisting tool 21 is opposed to the seat surface 20a of the chair 20 in the vertical direction. Figure 6

[0060] In short, the above-described second embodiment has the following features.

[0061] As shown in FIG. 1, the exercise system 200 includes a pedal exercise machine not shown, and the exercise assisting tool 21 that can be mounted on the seat surface 20a of the chair 20 and on which the user U is seated when the user U performs lower limb exercise using the pedal exercise machine 2. The exercise assisting tool 21 is provided with the seating portion 10 on which the user U is seated, and the support mechanism 11 that supports the seating portion 10 so as to be able to swing laterally. By the seating portion 10 swinging laterally when performing lower limb exercise, a movement chain of the lower limb and the torso is generated. According to the above structure, the movement chain of the lower limb and the torso can be realized when performing lower limb exercise in a seated posture. Figure 5

[0062] Although the first embodiment and the second embodiment of the present disclosure are described above, each of the above-described embodiments can be changed as follows.

[0063] That is, as shown in FIG. 1, in each of the above-described embodiments, each balloon 16 is in a hemispherical shape that protrudes downward in a state of being sealed with gas. However, instead of this, each balloon 16 can be a bellows type balloon provided with a bellows (serpentine tube) on the outer peripheral portion in such a manner as to be able to stretch and contract in the longitudinal direction, as shown in FIG. 2. Figure 3 Figure 6 Figure 7 Figure 8 ​​​​​As shown, a coil spring is used. In this case, the coil spring can be configured so that the long side direction becomes the vertical direction. In addition, the coil spring configured in place of the right ischial balloon 16R can also be inclined in a manner that becomes higher toward the medial side when viewed from the front of the chair 1 or the movement assisting device 21. In this case, since the repulsive force of the coil spring generated when the pelvis is laterally rotated acts in a manner that is slightly medial, the laterally rotated pelvis can be effectively returned to the neutral state. The same applies to the coil spring configured in place of the left ischial balloon 16L. Furthermore, for example, other elastic bodies such as rubber can also be used instead of each balloon 16.

[0064] Furthermore, the right ischial balloon 16R, the left ischial balloon 16L, and the coccyx balloon 16T can also be integrally configured instead of being configured as separate bodies. However, in this case, it is preferable to separate the internal spaces of the right ischial balloon 16R, the left ischial balloon 16L, and the coccyx balloon 16T from each other. This is because it is difficult for the right ischial balloon 16R and the left ischial balloon 16L to generate a repulsive force when the pelvis is laterally rotated without being isolated.

[0065] Furthermore, the support mechanism 11 can also have a plurality of coccyx balloons 16T. In this case, the plurality of coccyx balloons 16T are all disposed at a position that is further back than the right ischial balloon 16R and the left ischial balloon 16L.

[0066] Furthermore, in each embodiment, the yaw swing mechanism 13 can be omitted. In particular, in the second embodiment, in the case where the seat surface 20a of the chair 20 itself is supported so as to be able to be rotated in yaw, the yaw swing mechanism 13 possessed by the movement assisting device 21 can also be omitted.

[0067] From the disclosure thus described, it will be obvious that the embodiments of the disclosure can vary in many ways. These variations should not be considered as a departure from the spirit and scope of the disclosure, and all such modifications as are obvious to those skilled in the art are intended to be included within the scope of the following claims.

Claims

1. A motion system, comprising: Lower limb exercise equipment that enables repetitive lower limb movements involving extension and flexion of at least the knee and hip joints; A chair for the user to sit on when using the lower limb exercise equipment to perform lower limb exercises. In the motion system, The chair has the following features: A seating area for the user to sit down; A support mechanism that supports the seating portion in a tilting and swinging manner. By tilting and swinging the seated portion during the movement of the lower limbs, a kinetic chain between the lower limbs and the trunk is generated. The support mechanism includes: The right foot side elastomer is disposed below the seat portion and corresponds to the right foot side ischium of the user sitting on the seat portion. A left-foot-side elastomer is disposed below the seating portion and corresponds to the ischium (left-foot side ischium) of the user sitting on the seating portion. The right-foot side elastomer and the left-foot side elastomer are gas-sealed bags. The bag is a hemispherical shape that bulges downward when sealed with the gas.

2. A motion system, comprising: Lower limb exercise equipment that enables repetitive lower limb movements involving extension and flexion of at least the knee and hip joints; An exercise aid that can be mounted on the seat of a chair, and which allows the user to sit down when using the lower limb exercise equipment to perform lower limb exercises. In the motion system, The aforementioned sports assistive device includes: A seating area for the user to sit down; A support mechanism that supports the seating portion in a tilting and swinging manner. By tilting and swinging the seated portion during the movement of the lower limbs, a kinetic chain between the lower limbs and the trunk is generated. The support mechanism includes: The right foot side elastomer is disposed below the seat portion and corresponds to the right foot side ischium of the user sitting on the seat portion. A left-foot-side elastomer is disposed below the seating portion and corresponds to the ischium (left-foot side ischium) of the user sitting on the seating portion. The right-foot side elastomer and the left-foot side elastomer are gas-sealed bags. The bag is a hemispherical shape that bulges downward when sealed with the gas.

3. The motion system as described in claim 1 or 2, wherein, The support mechanism also corrects the pitch and flexion posture of the user's pelvis.

4. The motion system as described in claim 3, wherein, The support mechanism also includes a coccyx elastomer, which is disposed below the seating portion and corresponds to the coccyx of the user seated on the seating portion. The user's pelvic tilt posture is corrected by the coccyx elastomer.

5. The motion system as described in claim 4, wherein, The coccyx elastomer is either a gas-sealed bag or a helical spring.

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