A bicep exercising device has a frame with a housing, and a elbow cradle to hold the elbow in a chosen flexed position. The elbow cradle is adjustably attached to a frame and a rotatable handle grip. This allows for comfortable position of the hand in a palm down position and the elbow in a flexed position between about 179 degrees and 15 degrees. The handle rotates 180 degrees or more, thus allowing for full supination of the forearm. Using a supination motion of the forearm a user can exercise the bicep muscle.