Abstract: A system for exercising muscles that move the thigh according to various aspects of the present invention provides a source of resistance, suitably positioned, for the user to use when forcing the thigh to return to its original standing position, for instance, returning the foot to the floor. Such a system may include a base and an exerciser. The exerciser may include a positioner and a compliant surface. The compliant surface may include an elastic support and a foot receiver. The positioner establishes an initial position of the foot receiver.

Abstract: A system for exercising muscles that move the thigh according to various aspects of the present invention provides a source of resistance, suitably positioned, for the user to use when forcing the thigh to return to its original standing position, for instance, returning the foot to the floor. Such a system may include a base, an exerciser, and an upward motion limiter. The exerciser may include a position adjuster and a compliant surface. The compliant surface may include an elastic support and a foot receiver. The upward motion limiter may be mechanically coupled to any part of the exerciser to protect the user from unintended, perhaps sudden, release of energy, for example, from the elastic support.