Chin Up starting position: This exercise calls for a supinated grip (palms facing you) on the bar. It is easier to perform than the Pull Up because the biceps and forearms are at greater advantage when pulling, and the hands are closer together than with the Pull Up. The Chin Up also places less stress on the shoulders. With the Chin Up the body is slowly pulled upward until the chin is just above the bar and then slowly lowered.
To do a Pull Up, grasp a Pull Up bar with an overhand grip rather than the palms facing you. To reduce stress to the shoulders, pull the shoulder blades slightly down and back. Maintain this position and in a slow and controlled manner, pull your body upward through your fullest range of motion. Pause, and then slowly return to the starting position. Repetitions will vary according to strength capabilities.