Sit comfortably in an upright position. Lift your right arm directly in front of you. Your right arm is straight and parallel to the floor, and your right palm faces up. Keeping your arm comfortably straight, turn your palm downward. You'll feel your muscles gently contracting across the back of your forearm. Turn your palm face up again. You'll feel your muscles gently contracting across the top of your forearm. Relax and return to the starting position.