Core muscle strengthening shoes

Abstract

To provide core muscles strengthening shoes.SOLUTION: A publicly known shoe (5) includes a sole (10) provided below an upper (4), the sole (10) forming a round-like sole part (12) on the bottom of a sole body (11) attached on the lower side of the whole peripheral edge of the upper (4), the round-like sole part (12) formed so as to have a shape obtained by cutting a prolate spheroid in its longer direction and have a lower center part that is round and protrudes downwards, the sole body (11) having front and back ends at which front and back stop parts (15, 16) for preventing the round-like sole part from rolling excessively frontward and backward are formed, the front and back stop parts (15, 16) having positions at which formation of the round-like sole part (12) starts, the positions entering from the front and back ends of the sole body (11) toward the center of the sole by predetermined spaces, the sole body (11) having a heel support part (14) for wrapping and supporting a heel part, the heel support part formed above the back end of the sole body.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a shoe for strengthening core muscles, and more specifically, to a shoe that has a round sole portion formed on the bottom surface of the sole in the shape of a long spheroid cut lengthwise, which strengthens the core muscles while tensing the muscles of the entire body so that the wearer can balance themselves every time they step on the ground, and by forming front and rear stop portions on the front and rear of the round sole portion, if the shoe leans excessively forward or backward, the leaning can be stopped and the wearer can prevent falling, and by forming a heel support portion on the heel part of the sole body that wraps around and supports the back of the wearer's heel, the heel can be stably supported when the sole leans backward. [Background technology]

[0002] As shown in Figure 1, a balance board 1 is a well-known conventional exercise device for maintaining body balance. If you search for "balance board" on the online market on the Internet, you will easily find many products that are widely used by many people.

[0003] The balance board 1 is formed in the shape of a flat top, and is provided on the upper side with a flat platform part 2 on which the user steps with both feet. At the lower center of the platform part 2, a rolling support part 3 is formed in a convex shape that protrudes downward and whose bottom surface is supported by the floor surface and serves as the center of gravity for rolling.

[0004] When you stand on the top of the platform 2 of this flat top-shaped balance board 1 with both feet, as shown in Figure 1, one point of the top axis is supported on the ground and the upper body of the top wobbles in all directions, just as one point on the bottom of the rolling support part 3 of the balance board 1 touches the floor, the upper part of the balance board 1 wobbles in all directions.

[0005] At this time, the user standing on the balance board 1 moves from the soles of both feet to the top of the head in response to the swinging of the balance board 1 in order to stand upright without falling off the wobbly balance board 1, and the corresponding muscles of the body are tensed and trained.

[0006] When standing on the balance board 1 and trying to balance one's center of gravity, the muscles of the ankles and calves are used and trained, and then by putting force into the thighs to maintain balance, the thigh muscles are strengthened and the body is balanced, and the core muscles located in the trunk, namely the abdominal muscles, back muscles and buttock muscles, are stimulated to adjust the body's balance, and the muscles of the lower back are stimulated to correct incorrect posture due to loss of balance.

[0007] As mentioned above, the balance board 1 has the beneficial effect of strengthening the core muscles located in the trunk of the body. However, because the bottom surface of the rolling support part 3, which is the part that contacts the floor like a top and provides support, is in contact with the floor at only one point, it is very difficult for beginners to even stand on the balance board 1. If they are not careful even a little, they may fall and get injured as soon as they try to stand on the balance board 1. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Korean Utility Model Publication No. 20-2009-0002306 (Published March 6, 2009) Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention was devised to solve these problems, and its first technical objective is to form round sole sections on the bottom surfaces of both soles that function like the rolling support sections of a balance board, and to form the round sole sections in the shape of an oblong spheroid cut lengthwise, thereby preventing excessive leaning and allowing the wearer to safely balance themselves, to form front and rear stop sections on the front and rear of the round sole sections to stop excessive leaning forward or backward and prevent falls, and to form a heel support section in the heel section of the sole body that wraps around and supports the back of the wearer's heel, thereby enabling stable support of the heel when the sole leans backward.

[0010] A second technical objective of the present invention is to provide arch stimulation means on the inside front and rear of the round sole, which stimulates the arch of the sole when the round sole is stepped on, thereby enabling core muscle training and a massage of the soles of the feet to be performed simultaneously in the process of balancing the body.

[0011] Furthermore, the third technical objective of the present invention is to remove the round sole portion from the bottom surface of the sole body, store it, and then install a flat sole portion in its place, so that the shoe can be used as an everyday shoe and also to elastically massage the arch of the sole. [Means for solving the problem]

[0012] In order to achieve the above object, the present invention provides a known shoe in which a sole is provided below an upper, the sole having a rounded sole portion formed below a sole body attached to the underside of the entire periphery of the upper, the rounded sole portion having a shape obtained by cutting an oblong spheroid in the longitudinal direction and formed so that the lower central portion is rounded and protrudes downward, front and rear stop portions are formed at the front and rear ends of the sole body to prevent the rounded sole portion from rolling excessively forward and backward, the front and rear stop portions beginning to form the rounded sole portion at a position a predetermined distance from the front and rear ends of the sole body toward the central portion of the sole, a heel support portion is formed above the rear end of the sole body to wrap around and support the heel, the sole body and rounded sole portion are formed so as to be separable vertically, and the sole body and rounded sole portion are engaged with each other by detachable engaging means. the sole body is made of a cushion material and a presser foot installation hole is formed in the middle of the cushion body so as to penetrate vertically, the rounded sole portion has a pair of hard levers each made of a material harder than the sole body embedded in the sole body made of a cushion material, the hard levers each having an outer horizontal central portion and an inner arc-shaped lever portion integrally formed, a lower support portion is formed in the lower central portion of the arc-shaped lever portion, an upper hinge portion formed above the arc-shaped lever portion is provided so as to be exposed above the sole body, an arch portion presser made of a material harder than the cushion body is inserted into the presser foot installation hole, the arch portion presser has a rounded upper portion and a hinge hole formed in the lower portion, the upper hinge portion is hingedly installed in the lower hinge hole, and the rounded upper portion is installed so as to be exposed above the cushion body through the presser foot installation hole. [Effects of the Invention]

[0013] The core muscle strengthening shoes of the present invention described above have rounded soles formed on the bottom surface of both soles that function like the rolling support of a balance board. When worn on both feet, these shoes prevent falls from side to side and prevent excessive leaning, allowing even beginners to safely balance their bodies while strengthening their core muscles. Front and rear stop sections are formed on the front and rear of the rounded sole, which have the effect of stopping excessive leaning forward or backward and preventing falls. A heel support section is provided at the heel of the sole body to stably support the heel when the sole leans backward, wrapping around and supporting the back of the wearer's heel. This has the effect of preventing backward falls and spraining the ankle.

[0014] In addition, by providing arch stimulation means on the inside front and rear of the round sole, which stimulates the arch of the sole when the round sole is stepped on, it is possible to train core muscles and massage the soles of the feet at the same time in the process of balancing the body.

[0015] Furthermore, after removing the round sole portion from the bottom of the sole body and storing it, a flat sole portion can be placed in its place to use it as everyday shoes, and by elastically massaging the arch of the sole, it has the effect of relieving fatigue in the soles of the feet. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a diagram illustrating a state in which a conventional balance board is used. [Figure 2] 1 is a bottom perspective view showing a shoe for strengthening core muscles according to a first embodiment of the present invention. [Figure 3] FIG. 3 is a perspective view of a sole included in the present invention shown in FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view of the sole shown in FIG. 3. [Figure 5]5(A) and 5(B) are side views showing the operational relationship of the sole shown in FIGS. 3 and 4. FIG. [Figure 6] FIG. 10 is a cross-sectional view showing a second embodiment of a sole included in the present invention. [Figure 7] FIG. 7 is a cross-sectional view showing the sole shown in FIG. 6 in a separated state. [Figure 8] FIG. 10 is a cross-sectional view showing a third embodiment of a sole included in the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, the core muscle strengthening shoe according to the present invention will be described with reference to the accompanying Figs.

[0018] As shown in Figures 2 to 4, the core muscle strengthening shoe according to the first embodiment of the present invention is a known shoe 5 having a sole 10 attached to the lower part of an upper 4, in which the sole 10 forms a round sole portion 12 at the lower part of a sole body 11 attached to the underside of the entire periphery of the upper 4, and the round sole portion 12 has the shape of an elongated spheroid cut lengthwise, with the central part on the lower side being rounded and raised downward.

[0019] At the front and rear ends of the sole body 11, front and rear stop portions 15, 16 are formed to prevent the round sole portion 12 from rolling too far forward and backward. The front and rear stop portions 15, 16 are formed at a position where the round sole portion 12 begins to form, a predetermined distance from the front and rear ends of the sole body 11 toward the center of the sole, and a heel support portion 14 is formed above the rear end of the sole body 11 to wrap around and support the heel.

[0020] Figures 6 and 7 show a second embodiment of the sole 10 included in the present invention, in which the sole body 11 and the round sole portion 12 are formed separably, and an arch portion holder 23 is included between the sole body 11 and the round sole portion 12 to massage the arch portion of the sole of the foot.

[0021] The sole body 11 has a retainer installation hole 22 in which an arch retainer 23 is inserted, formed in the middle part of the cushion body 18, which is made of a material having a predetermined cushioning. The retainer installation hole 22 is formed by a retainer exposure hole 21 that opens upward so that the upper surface of the arch retainer 23, which has a rounded upper surface, is exposed above the cushion body 18, and a retainer receiving hole 20 that is formed so that the inner peripheral edge is larger than the inner diameter of the retainer exposure hole 21 so that the outer contour of the arch portion retainer 23 hangs below the inner peripheral edge of the retainer exposure hole 21.

[0022] An engaging protrusion frame 17 is formed on the bottom surface of the cushion body 18 around the outer periphery of the retaining hole 20 so as to protrude downward, and a screw hole 19 is formed in the cushion body 18 inside the engaging protrusion frame 17 so as to penetrate vertically, into which a screw 27 is inserted to be connected to the rounded sole portion 12 connected to the lower part of the sole body 11, and the screw hole 19 is formed so that the counter boring 19a at the top, into which the head of the screw 27 is recessed, is larger than the screw body insertion hole 19b at the bottom, into which the screw body is inserted.

[0023] The round sole portion 12 has a sole body 25 made of a material with a predetermined cushioning, which has the shape of a long spheroid cut longitudinally, and is formed so that the lower central part is rounded and protrudes downward. A fitting hole 26 into which the fitting protrusion frame 17 is detachably fitted is formed on the upper surface of the sole body 25, and a pair of hard levers 30 made of a material harder than the sole body 25 are embedded in the front and rear of the sole body 25 inside the fitting hole 26.

[0024] In this case, the rigid lever 30 has an arc-shaped lever portion 32 integrally formed at the inner end of a horizontal fixing portion 31 equipped with a female thread portion 31a to which the threaded portion of the screw 27 is fastened, a lower support portion 33 formed to protrude downward from the central lower portion of the arc-shaped lever portion 32, and an upper hinge portion 34 formed at the upper end of the arc-shaped lever portion 32, with only the upper hinge portion 34 of the rigid lever 30 protruding above the sole body 25 and the entire rigid lever 30 except for the upper hinge portion 34 being embedded in the sole body 25, and the upper hinge portions 34 on the front and rear sides being installed close to the central portion of the round sole portion 12.

[0025] The arch portion retainer 23 has a rounded upper surface to correspond to the arch portion of the sole of the foot, and is made of a material that is stronger than the cushion body 18. Hinge holes 24 are formed on the lower front and rear sides of the arch portion retainer 23, into which the upper hinge portions 34 of the front and rear hard levers 30 are hingedly fitted, and the rounded upper surface of the arch portion retainer 23 is inserted into the retainer receiving hole 20 so that the retainer exposure hole 21 is exposed upward.

[0026] Next, a third embodiment of the sole 10 shown in FIG. 8 will be described. The sole 10 according to the third embodiment has the same configuration as the sole body 11 and arch holder 23 included in the sole 10 according to the second embodiment shown in FIGS. 6 and 7, and differs only in the structure of the flat sole portion 40 installed below the sole body 11. Therefore, a description of the same configuration will be omitted, and only the different flat sole portion 40 will be described in detail.

[0027] That is, the flat sole portion 40 included in the sole 10 of the third embodiment is made of a material with a predetermined cushioning and is formed in the shape of a typical flat-bottomed sole, and an engagement hole 26 is formed on the upper surface of the flat sole portion 40 so that the engagement protrusion frame 17 can be detachably fitted therein, and a hard support base 41 made of a material that is stronger than the flat sole portion 40 is insert-molded into the flat sole portion 40 inside the engagement hole 26.

[0028] At this time, female thread portions 31a are formed on the front and rear of the hard support base 41 to be fastened to the thread portion of the screw 27 installed downward from the sole body 11, and a spring receiving groove 42 is formed in the center of the hard support base 41, and a spring 43 is elastically installed between the lower part of the arch portion holder 23 and the spring receiving groove 42.

[0029] In the drawings, the unexplained reference numeral "13" denotes an upper wrapping portion that attaches the upper 4 to the sole 10.

[0030] The operation of the present invention configured as above will be described below with reference to FIGS.

[0031] First, the shoe according to the first embodiment of the present invention shown in Figures 2 to 5 has a round sole portion 12, which is formed integrally on the bottom surface of the sole body 11 and has the shape of a long sphere cut in the longitudinal direction from front to back. As a result, when the wearer stands with one foot on the ground, one point on the axis of the conical top pivots against the ground.

[0032] When one point of the axle of a top pivots against the ground, the upper part of the body of the top wobbles in all directions, making it easy to fall over. Similarly, the shoes of the present invention also have a round sole portion 12 formed at the bottom of the sole 10, like the axle of a top. Therefore, although there is a possibility that a wearer may fall over while wearing the shoes of the present invention, when wearing such shoes on both feet and placing both feet on the ground, swaying from side to side is minimized, making it easy for even beginners to stand on the ground.

[0033] As described above, by wearing a pair of shoes, one on each side, with round sole portions 12, side-to-side movement can be minimized, but forward and backward rolling action becomes more likely to occur, so the wearer must balance their body and stand properly to avoid falling forward and backward.

[0034] In this state, when one foot is lifted and only the other foot touches the ground for walking or exercise, a point on the bottom center of the round sole portion 12, which corresponds to the axis of the top, touches the ground in a pivotal manner as described above, causing the wearer's body to sway in all directions as if they are about to fall over.

[0035] When standing on one foot in this way, if the wearer is likely to fall, he or she moves his or her body to maintain balance, but as the round sole portion 12 swings from the sole of the foot to the tip of the head, the muscles in the body that are in contact with the swinging portion are tense and trained.

[0036] As described above, when trying to maintain one's center of gravity on the round sole portion 12, the ankle and calf muscles are used and trained, and then by applying force to the thighs for balance, the thigh muscles are strengthened and the body is balanced. The core muscles located in the trunk, namely the abdominal muscles, back muscles, and buttock muscles, are stimulated, and the body balance is improved, and the lower back muscles are stimulated, and incorrect posture due to imbalance is corrected.

[0037] As shown in FIGS. 4 and 5, if excessive forward and backward rolling occurs during the rolling action of the round sole portion 12, the front and rear stop portions 15 and 16 formed at the front and rear ends of the sole body 11 stop the rolling action of the round sole portion 12, thereby minimizing the risk of falling.

[0038] In other words, when rolling in the forward and backward direction with only the rounded bottom surface of the rounded sole portion 12 touching the ground, the rolling action continues due to the rounded bottom surface, but front and rear stop portions 15, 16 are formed at a predetermined distance between the front and rear ends of the rounded sole portion 12 and the front and rear ends of the sole body 11, and as the rounded sole portion 12 rolls, the flat bottom surfaces of the front and rear stop portions 15, 16 come into contact with the ground together, stopping the rolling action and preventing excessive rolling action, thereby minimizing forward and backward falls.

[0039] The heel of the sole body 11 is formed with a heel support part 14 that wraps around and supports the heel. When the wearer leans too far backward so that the rear stop part 16 touches the ground as shown in FIG. 5A, the heel support part 14 wraps around and supports the wearer's heel, applying force to the ankle and firmly supporting it. This allows the wearer to roll with the correct posture without losing the angle of the ankle, thereby preventing falls and ankle injuries.

[0040] Next, a second embodiment of the sole 10 shown in Figures 6 and 7 is shown. This has the same existing configuration as the first embodiment, but after the sole body 11 and the round sole portion 12 are removed and configured, an arch portion holder 23 that massages the arch portion of the sole of the foot is further installed between the sole body 11 and the round sole portion 12.

[0041] Therefore, as in the first embodiment, the round sole portion 12 performs a rolling action, and thus the muscles of the body are trained in the same way in the process of balancing the body. Therefore, a description of the same parts will be omitted, and a specific description will be given of the sole body 11 and the round sole portion 12 being detachably engaged and set up by a detachable engaging means, and of the massage of the arch portion of the sole of the foot.

[0042] When a pair of hard levers 30 are to be used to install the round sole portion 12 embedded in the front-rear direction on the bottom surface of the sole body 11, a fitting protrusion frame 17 formed to protrude downward on the bottom surface of the sole body 11 is fitted into a fitting hole 26 formed on the upper surface of the round sole portion 12.

[0043] At this time, the cushion body 18 forming the fitting protrusion frame 17 and the sole body 25 forming the fitting hole 26 are made of a synthetic resin material with a predetermined cushioning, the neck of the fitting protrusion frame 17 is narrowed, and the entrance of the fitting hole 26 is formed in a shape corresponding to the fitting protrusion frame 17, so that when the fitting protrusion frame 17 and the fitting hole 26 are fitted together, foreign matter including moisture and dust is prevented from flowing into the area where the bottom surface of the sole body 11 and the top surface of the round sole portion 12 are joined.

[0044] After the sole body 11 and the rounded sole portion 12 are initially joined together in this manner, a screw 27 is inserted downward into the screw hole 19 formed above the sole body 11, and the thread body of the screw 27 is fastened to the female thread portion 31a of the hard lever 30 embedded in the front stop portion 15, thereby firmly joining and installing the sole body 11 and the rounded sole portion 12.

[0045] The screw hole 19 has a cushion body 18 having a predetermined cushion, and at the top, a counterbore 19a is formed so that the head of the screw 27 is recessed, and at the bottom, a screw body insertion hole 19b is formed so that the screw body is inserted, and the screw 27 is made of metal or hard synthetic resin material.

[0046] Under these circumstances, when walking with shoes on and the sole of the foot steps on the ground, the head of the screw 27 sinks into the inside of the counterbore 19a, preventing pain, and the hard screw 27 is firmly fastened to the female thread portion 31a of the solid hard lever 30.

[0047] The sole body 25 included in the round sole portion 12 is made of a cushioning material, and the hard lever 30 embedded in the sole body 25 is made of a hard synthetic resin material. When the wearer walks or exercises while stepping on the ground, the sole body 25 made of a cushioning material is compressed by the load of the wearer stepping on the ground, but the hard lever 30 made of a hard material is not compressed and is stepped on in a hard state.

[0048] In this way, when the rigid lever 30 is stepped on and the round sole portion 12 performs a rolling motion, the arc-shaped lever portion 32 of the rigid lever 30 is formed in a rounded arc shape downward, and the lower support portion 33, which acts as the lever's weight, is formed to protrude downward from the lower center of the arc-shaped lever portion 32, and the horizontal fixing portion 31 protrudes outward like the handle of a dipper.When the horizontal fixing portion 31 is pressed during walking, the upper hinge portion 34 acts as a lever around the lower support portion 33, and a supporting force acts upward.

[0049] Above the upper hinge portion 34 where such an upward supporting force acts, an arch portion presser 23 with a rounded upper surface made of a hard material is hingedly installed, and the arch portion presser 23 is inserted into the presser installation hole 22 of the sole body 11 and installed so that its upper surface is elevated above the presser exposure hole 21. As such, the upward supporting force acts, and the upper surface of the arch portion presser 23 rolls and massages the arch portion of the sole of the foot as it walks.

[0050] The hard levers 30 are embedded in the front and rear of the round sole portion 12, and the upper hinge portions 34 formed on the front and rear hard levers 30 protrude toward the center, and the lower hinge holes 24 of the arch holder 23 are hingedly fitted into the protruding upper hinge portions 34, so that when the front hard lever 30 steps on the ground via the round sole portion 12 and when the rear hard lever 30 steps on the ground, the upper hinge portions 34 and hinge holes 24 on the front and rear sides act in a hinged manner to rhythmically massage the arch of the foot.

[0051] As described above, when massaging the arch of the sole of the foot with the arch holder 23, the arch holder 23 is made of a hard material to stimulate the arch of the sole of the foot, but by placing an insole with a predetermined cushion on top of the sole body 11 where the arch holder 23 is installed, it is clear that the arch of the sole of the foot will not become stiff and painful.

[0052] Next, a third embodiment of the sole 10 shown in FIG. 8 will be described. This is used when the round sole portion 12 is removed from the underside of the sole body 11 according to the second embodiment, and then a general flat sole portion 40 with a flat bottom is installed in the place where the round sole portion 12 was removed, thereby intending to use the sole as an ordinary shoe.

[0053] The first embodiment shown in FIG. 4 or the second embodiment shown in FIG. 6 has a round sole portion 12 with a rounded bottom surface, which may make normal walking or driving difficult. Therefore, when the purpose is exercise, the round sole portion 12 is attached to the bottom of the sole body 11, and when it is intended to be used as a normal shoe, the flat sole portion 40 shown in FIG. 8 is attached and used.

[0054] That is, when the flat sole portion 40 is connected to the lower part of the sole body 11 of the sole 10 according to the third embodiment shown in FIG. 8, the fitting protrusion frame 17 according to the second embodiment is fitted into the fitting hole 26 to first connect them, and then the screw 27 passing through the screw hole 19 downward is fastened to the female thread portion 31a of the hard lever 30 in the same manner.

[0055] In this case, in the second embodiment, the part to which the thread body of the screw 27 is fastened is the female thread portion 31a of the rigid lever 30, and in the third embodiment, the thread body of the screw 27 is fastened to the female thread portion 31a formed in the rigid support base 41. When installing the flat sole portion 40 under the sole body 11 in this manner, with the spring 43 inserted into the lower part of the arch portion presser 23, the upper surface of the arch portion presser 23 is inserted into the presser installation hole 22, and the lower part of the spring 43 is inserted into the spring receiving groove 42 of the rigid support base 41. Then, the detachable engaging means, i.e., the engaging protrusion frame 17 and the engaging hole 26, engages with each other, and the thread body of the screw 27 is fastened to the female thread portion 31a of the rigid lever 30, and the flat sole portion 40 is installed under the sole body 11.

[0056] When the flat sole portion 40 according to the third embodiment is connected to the bottom of the sole body 11, the arch support 23, which is elastically installed by the spring 43, stimulates and massages the arch of the sole of the foot every time the foot steps on the ground during walking. [Explanation of symbols]

[0057] 1 balance board 2 Scaffolding 3 Rolling support 4 Upper 5. Shoes 10 soles 11 Sole body 12 Round sole 13 Upper wrapping section 14 heel support 15 Front stop 16 Rear stop 17. Fitting protrusion frame 18 Cushion body 19 screw holes 20 Retainer hole 21 Presser foot exposure hole 22 Holder installation hole 23 Arch support 24 hinge holes 25 Sole body 26 Fitting hole 27 Screw 30 Hard Lever 31 Horizontal fixing part 32 Arc-shaped lever part 33 Lower support part 34 Upper hinge part 40 Flat sole 41 Rigid support 42 Spring receiving groove 43 Spring

Claims

1. In shoes where the sole is attached to the bottom of the upper, The sole has a round sole portion formed at the bottom of a sole body attached to the underside of the entire periphery of the upper, the round sole portion having a shape obtained by cutting an elongated spheroid in the longitudinal direction and a lower central portion that protrudes downward in a round shape; At the front and rear end portions of the sole body, front and rear stop portions are formed to prevent the rounded sole portion from rolling excessively forward and backward, and the front and rear stop portions are formed at a position that is a predetermined distance from the front and rear end portion of the sole body toward the center portion of the sole, and a heel support portion that wraps around and supports the heel portion is formed above the rear end portion of the sole body, The sole body and the round sole portion are formed so as to be separable from each other vertically, and the sole body and the round sole portion are engaged with each other by a detachable engaging means, The sole body is made of a cushion material and has a pressure installation hole formed in a middle portion thereof so as to penetrate vertically. The round sole portion has a pair of hard levers each made of a material harder than a sole body made of a cushioning material and embedded in the sole body, the hard levers each having an outer horizontal fixing portion and an inner arc-shaped lever portion integrally formed therewith, a lower support portion formed in the lower center of the arc-shaped lever portion, and an upper hinge portion formed above the arc-shaped lever portion so as to be exposed above the sole body, The shoe for strengthening core muscles is characterized in that an arch portion retainer made of a material harder than the cushion body is inserted into the retainer installation hole, the arch portion retainer has a rounded upper part and a hinge hole formed on the lower part, the upper hinge portion is installed in the lower hinge hole, and the rounded upper part is installed so as to be exposed above the cushion body through the retainer installation hole.

2. The detachable engaging means is formed on the bottom surface of the cushion body outside the retaining hole so that a fitting protrusion frame protrudes downward, and on the top surface of the sole body, a fitting hole is formed into which the fitting protrusion frame is detachably fitted, 2. The shoe for strengthening core muscles according to claim 1, characterized in that a screw hole is formed in the cushion body inside the fitting protrusion frame so as to penetrate vertically, the countersink in the screw hole at the top into which the head of the screw is recessed is larger than the lower screw body insertion hole into which the screw body is inserted, and the horizontal fixing part is formed with a female thread part into which the threaded part of the screw inserted through the screw hole is fastened.

3. The sole body and the round sole part are formed so as to be separable from each other vertically, and a flat sole part having a general flat bottom is provided in place of the round sole part. The sole body has a cushion body made of a cushion material and a presser installation hole formed in a middle portion thereof so as to penetrate vertically, and a fitting protrusion frame formed on a bottom surface of the cushion body outside the presser installation hole so as to protrude downward, The flat sole portion is made of a cushioning material, and a fitting hole into which the fitting protrusion frame is detachably fitted is formed on the upper surface of the flat sole portion. A hard support base made of a material harder than the flat sole portion is insert-molded into the flat sole portion inside the fitting hole. The rigid support base has female threads formed at its front and rear to be fastened to the threads of the screw installed downward from the sole body, and a spring receiving groove formed in the center of the rigid support base.

3. A shoe for strengthening core muscles according to claim 1 or 2, characterized in that an arch retainer made of a material harder than the cushion body is inserted into the retainer installation hole, a spring is elastically installed between the lower part of the arch retainer and the spring receiving groove, and the upper round part is installed so as to be exposed above the cushion body through the retainer installation hole.

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