Patent ID: 7976436

Claim:
A stair stepping exercise device comprising: two spaced-apart exercise devices, each consisting of: an airspring, said airspring consisting of an elastomeric bellows intermediate portion, a closed lower portion and a closed upper portion, a lever arm adapted to be attached to a portion of the closed upper portion of the airspring, a rigid unsprung frame member adapted to be attached to a portion of the closed lower portion of the airspring and to be attached to a working surface, and a human body engaging member consisting of a foot-positioning surface located at a distal end of the lever arm away from a vertical axis extending through a center of said airspring; and means for adjustably pressurizing the airspring, wherein the lever arm is movable at a desired resistance level and a desired angular displacement by a movement of the human body engaging member at the foot-positioning surface, wherein said foot-positioning surface is angularly displaced about said vertical axis extending through said airspring as a user stands on said foot-positioning surface and exercises, and wherein each of said two spaced-apart exercise devices operate independently of each other wherein when one said foot-positioning surface on one of said two spaced-apart exercise devices is depressed by the user, the other of said foot-positioning surface on said other spaced-apart exercise device will not move until said user depresses it.