Patent ID: 8147387

Claim:
A muscle exercise device, comprising: (a) a crank having an axis of rotation; (b) a first arm connected to the crank and extending substantially perpendicular from the axis of rotation, configured so that a downward external force applied to a distal end of the first arm causes rotation of the crank; (c) a second arm connected to the crank and extending substantially perpendicular from the axis of rotation in a direction substantially opposite to that of the first arm; and (d) a counterweight with respect to the first arm to assist in rotating the crank, operatively connected and removably attached to the second arm by a removable attachment and weighing from 5 to 70 pounds, and wherein the first arm does not have a removable attachment for a second counterweight so as to provide an asymmetric weight distribution across the crank that is weighted toward the second arm.