Abstract: An exercise apparatus including a platform for a user to stand or sit upon, mounted on a body formed of two wedge-shaped parts which are turned relative to each other so that the platform is inclined relative to a base. The platform is coupled to the top of the body via a first bearing, and the body is coupled to the base by a second bearing: the platform is prevented from rotating relative to the base by a gimbal arrangement. A motor coupled to a shaft rotates the body so that the direction of tilt of the platform sweeps around in a corresponding circular manner.