Patent ID: 7862491

Claim:
A resistance arrangement of a waist-twisting machine comprising: a bottom base, a foot-rotating disc rotatable about a first vertical axis, a handrail frame, a lateral post rotatable about the first vertical axis and coupling the foot-rotating disc and the handrail frame such that operation of the foot-rotating disc imparts a motion to the lateral post such that the foot-rotating disc and the handrail frame rotate in opposite direction about the first vertical axis, a contact roller arranged at a bottom surface of the lateral post, two driven arms pivotally attached to the bottom base, a plurality of elastic elements interposed between the driven arms; and a bumping post positioned between the driven arms so as to limit the driven arms to a return position; wherein one of the driven arms corresponding to a first exercise direction is extended outwards by the contact roller when the lateral post is moved and wherein the other driven arm, remains fixed in place such that the elastic elements are pulled to produce an exercise resistance and to exert a return force on the lateral post towards a middle position.