US Patent 7806807 Exercise device for improving balance

An exercise device for improving balance, comprising a platform; a balancing element mounted to the platform so as to permit angular displacement of the balancing element relative to the platform; an adjustable angular displacement limiter for determining a limit of the angular displacement of the balancing element relative to the platform; and an adjustment access path to provide adjustment access to the limiter while the balancing element is operably mounted to the platform.