In accordance with the principles of the present invention an exercise device is provided that comprises an oscillating platform and a support platform. The oscillating platform is connected to the support platform by a support having a main axis and an oscillating platform axis extending at an angle from the main axis, such that the oscillating platform defines a plane that is non-parallel to a plane defined by the support platform. An oscillating platform stabilizer enables the free angular undulating movement of the oscillating platform. Inertia or momentum of the angular movement of the platform is provided, thereby providing a fluid and continuous change in the angular orientation of the platform.