Patent ID: 7090628

Claim:
An exercise apparatus comprising, an oblong support board having an upper portion and a lower portion and at least one unconfined open free longitudinal end portion to permit the upper body portion of a person to be supported on the upper portion with the person's legs extending beyond the unconfined open free longitudinal end portion, tilting means being joined to the lower portion of said support board for supporting the support board in an unrestrained, unstable support position wherein the support board is freely tiltable about a longitudinal axis, said tilting means having at least one support bearing below the upper portion of the support board and said longitudinal tilt axis extends through said support bearing, said support board being pivotable in opposite transverse directions about the longitudinal tilt axis, and tilt limiting means being provided at the lower portion of said support board for limiting the tilting excursion of the support board in said opposite transverse directions, whereby a person lying face up or face down on the upper portion of the support board and exercising thereon with feet extended beyond said open free longitudinal end portion to rest against a firm surface must also use muscles to prevent the support board from tilting, thereby strengthening the abdominal or back muscles depending upon the face up or face down position of the person.