Abstract: A rebounding exercise device is disclosed in which at least two rebounding surfaces are supported at an incline relative to horizontal. The low ends of the rebounding surfaces are near each other so that one can use the rebounding device by jumping from one surface to the other. In particular, the rebounding device includes a mat which is supported in a V shape by a plurality of springs about the periphery of the mat. Loops are provided along the center portion of the mat by which the center portion of the mat can be pulled down so that the V shape is approximately maintained during use.

Abstract: An adjustable connection between a ski and its binding, comprising an elevated platform that is attached to the ski at two longitudinally spaced points by supports that allow the ski to flex between the supports. Mounted on top of the elevated platform is a boot plate, to which the ski binding is attached. The boot plate is attached to the platform by screw connections that allow for rotation of the boot plate about a vertical axis, or for translation in the fore-and-aft or lateral directions. The supports, in one form of the invention, are individually adjustable in length so that the platform can be tilted laterally with respect to the top surface of the ski, or tilted longitudinally, or raised and lowered while maintaining parallelism with respect to the ski. Thus, the invention allows for rotational adjustment about any one or all 3 mutually perpendicular axes, as well as translational adjustment in all 3 planes, all without removing the ski bindings from the platform, or the platform from the ski.