Patent ID: 7695407

Claim:
An exercise apparatus resting on a ground surface and having a body including: a top surface configured for being stood on by a user; a bottom surface configured for partially resting on the ground surface at a balance point; a pair of oppositely located side surfaces; a front portion curving in a direction away from the ground surface and having a front portion end; and a back portion oppositely located from said front portion and curving in a direction away from the ground surface, said back portion having a back portion end; wherein said bottom surface is configured for enabling rotational and lateral pivoting movement of the apparatus about the balance point and relative to the ground surface, wherein said front portion end is more distally located from said balance point than said back portion end, and further wherein an angle β defining a curvature of said bottom surface between said front portion adjacent said balance point and the ground surface is in the range of 10-15°.