Patent ID: RE43981

Claim:
An exercise apparatus comprising: a curved partial cylindrical barrel shaped body having a bottom surface, an upper curved surface, a first end face, a second end face, and a rear wall between the bottom surface and upper curved surface, said upper curved surface including a first cylindrical surface portion merging with a second cylindrical surface portion forming a continuous smooth curved surface, the first surface portion having a first radius of curvature about a first axis, the second surface portion having a second radius of curvature about a second axis parallel to the first axis, wherein the first radius of curvature is different from the second radius of curvature and the first and second axes together define a plane through a line of intersection of the first and second cylindrical surface portions, and said rear wall having at least one recess to form a tongue and groove configuration; a removable step block having a bottom surface, a top surface, and an upright front wall between the bottom surface and the top surface, said upright front wall having at least one recess to form a mating complementary tongue and groove configuration to engage the tongue and groove configuration of the rear wall of the curved partial cylindrical barrel shaped body; said step block removably connected to the partial cylindrical barrel body through engagement of the tongue and groove configuration of the rear wall of the curved partial cylindrical barrel shaped body with the complementary tongue and groove configuration of the upright front wall of the step block; and wherein the top surface of the step block forms a continuous smooth surface with the upper surface of the partial cylindrical barrel shaped body and the first end face and the second end face each has a plurality of parallel spaced recesses extending perpendicular to the bottom surface defining a plurality of vertical ribs therebetween.