Abstract: A step for performing exercises is polygonal or circular to allow approaches from any direction equally. The step has a base member and a platform member, the platform member being selectively adjustable with respect to the base. The base member has lands equally spaced around the base member at different heights, and the platform member has shoulders equally spaced around the platform member to be received on the lands. By selecting the proper lands for the shoulders, the height of the platform can be changed. Also, the platform member may be used without the base member for a lower height step. Preferably there are five shoulders and five lands in each group of lands for stability of the platform.

Abstract: A step for performing exercises is circular to allow approaches from any direction equally. The step has a base member and a platform member, the platform member being selectively movable with respect to the base. The base has a plurality of grooves, and the platform has a plurality of tongues to be received in the grooves. There are grooves of different depths so that, by selecting the proper grooves for the tongues, the height of the platform can be changed. An elastic may hold the base and platform together while allowing adjustment.