Start: Sit on a bench and lean toward your dominant side, grabbing the side of the bench to steady yourself. With an overhand grip, hold a dumbbell in your nondominant hand and raise it at arm's length above your shoulder so your arm and torso are at the same angle.
Finish: Bend your elbow to lower the weight until its an inch or two above your jaw. Pause, the return to the starting position. Keep your upper arm in the same position throughout Finish the set with that arm, then repeat with the other.