Those where it discloses here are the twist motion instrument for exercising the waist and the leg. When it is the twist motion instrument which consists of the base, the rotary board and the axis of rotation, the user rides in the aforementioned instrument once, steps on that, it is something where the aforementioned rotary board power of weight of the user and receives the bounce of the spring or compressed air, moves the aforementioned board to the upper part or the lower part, is linked with the vertical motion of the aforementioned rotary board, at least like below makes 4 step left and right rotary cycle expedients of 1 units possible. Once when it moves to the lower part, the left revolution (the left rotary step to the lower part) it does the aforementioned rotary board, moves to the upper part when the right revolution (the right rotary step to the upper part) it does, again to the lower part it moves when the right revolution (the right rotary step to the lower part) does, to the upper part again furthermore moves the left revolution (the left rotary step to upward) doing, it is something which forms complete 4 step cycles. Selective figure Figure 1
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