Patent ID: 8133160

Claim:
An inertial exercise device, comprising: first and second terminal masses rigidly linked together by a central shaft, the first and second terminal masses and the central shaft collectively having an inertia; an actuating sleeve slidably mounted around the central shaft, the actuating sleeve comprising an internal bore with a first peripheral shoulder formed by a segment of the internal bore with a reduced internal diameter; a first elastic resistance element mounted on the central shaft concentric with the internal bore of the actuating sleeve and disposed between the first terminal mass and the first peripheral shoulder; and wherein the first and second terminal masses and the central shaft are slidable relative to the actuating sleeve between a first position with the first elastic resistance element compressed between the first terminal mass and the first peripheral shoulder and a second position with the first elastic resistance element extended; and wherein the inertia of the first and second terminal masses and the central shaft causes the actuating sleeve to oscillate relative to the first and second terminal masses and the central shaft in response to alternating rhythmic linear motion imparted to the actuating sleeve by a user of the inertial exercise device.