Abstract: An exercise device of the type employing an elastic cable to provide a restoring force comprises a handle attached to a plurality of elastic cables. The plurality of elastic cables are selectively attachable to a retainer assembly to provide a wide range of variation in restoring force exerted against the handle. The plurality of cables may also be enclosed in a flexible sheath to prevent the unattached, inactive cables from becoming entangled with each other or with the attached, active cables.

Abstract: The sporting and exercising device comprises an upper foot-receiving portion, and a lower spring portion. The spring portion comprises an upper spring layer arched upwardly, a lower spring layer arched downwardly, and an intermediate elastic plastic strap. A first end of the plastic strap is connected to both a first end of the upper spring layer and a first end of the lower spring layer, and a second end of the plastic strap is connected to both a second end of the upper spring layer and a second end of the lower spring layer. First and second resilient shock absorbing bodies are mounted on the top face of the plastic strap proximate the first and second ends thereof, respectively. Similarly, third and fourth resilient shock absorbing bodies are mounted on the bottom face of the plastic strap proximate the first and second ends thereof, respectively. The resilient shock absorbing bodies prevent the spring portion to collapse after a certain deformation by compression has been reached.