Abstract: An exercise apparatus includes a substantially flat, rigid platform for supporting a person's weight. A first inflatable tubular support includes a fastener for clamping the platform to a top surface of the first tubular support. A second inflatable tubular support includes a fastener for fastening a top surface of the second inflatable tubular support to a bottom surface of the first inflatable tubular support. The first inflatable tubular support is inflatable to a first inflation pressure and the second inflatable tubular support is inflatable to a second inflation pressure separately and independently from the first inflation pressure to effect a vertical instability and a horizontal instability of the rigid platform relative to a support surface under the second tubular support.

Abstract: An exercise apparatus includes a substantially flat, rigid platform for supporting a user during exercise. An inflatable tubular support having an upper portion with a first radial outside diameter, and a lower portion with a second radial outside diameter that is greater than the first radial outside diameter, is coupled to the platform by a fastener. The tubular support defines a central opening that communicates between the platform and a support surface. The platform includes a venting structure for releasing air from the central opening during use. The inflatable support includes an intermediate portion between the upper portion and the lower portion of the tubular support, the intermediate portion including a support feature to restrain the intermediate portion from radial expansion induced by an air pressure internal to the integral inflatable support.

Abstract: An exercise apparatus includes a substantially flat, rigid platform for supporting a user during exercise. An inflatable tubular support having an upper portion with a first radial outside diameter, and a lower portion with a second radial outside diameter that is greater than the first radial outside diameter, is coupled to the platform by a fastener. The tubular support defines a central opening that communicates between the platform and a support surface. The platform includes a venting structure for releasing air from the central opening during use. The inflatable support includes an intermediate portion between the upper portion and the lower portion of the tubular support, the intermediate portion including a support feature to restrain the intermediate portion from radial expansion induced by an air pressure internal to the integral inflatable support.

Abstract: An exercise apparatus includes a substantially flat, rigid platform for supporting a person's weight. A first inflatable tubular support includes a fastener for clamping the platform to a top surface of the first tubular support. A second inflatable tubular support includes a fastener for fastening a top surface of the second inflatable tubular support to a bottom surface of the first inflatable tubular support. The first inflatable tubular support is inflatable to a first inflation pressure and the second inflatable tubular support is inflatable to a second inflation pressure separately and independently from the first inflation pressure to effect a vertical instability and a horizontal instability of the rigid platform relative to a support surface under the second tubular support.