A portable exercising apparatus for isolating a user's torso muscles during operating conditions includes at least one wheel section that has at least one rim including a plurality of spokes, an elongated axle, and at least one hub including a bearing disposed therein. The apparatus further includes a mechanism for supporting a user's feet at an elevated position and along a substantially horizontal plane. Such a supporting mechanism is secured to the axle and is disposed adjacent the at least one wheel section to thereby allow a user to perform exercise movements while extended along a generally horizontal plane. The present invention may reside in alternate embodiments wherein various wheel sections cooperate with the supporting mechanism for providing an effective exercising apparatus.