Physical training assembly for foot and leg muscles is an open-top box with a charge of granular particles

摘要

A gymnasium has an assembly for training and enhancing leg and foot muscles. The assembly is an open box (2) whose inner volume (15) is filled with a granular medium bed (7). The feet and legs thrust against the granular medium. The bed further has a hand-hold (21) and a hinged lid (3) that is closed when the box is not in use.