The higher you set the handles the easier the exercise becomes. For maximum muscle building, you want the cables hanging less than 3 feet (1 meter) off the ground. Place your feet against a wall and hang from the handles with palms facing TOWARDS YOU, arms fully stretched and body straight.
Lift yourself up by pulling your shoulder blades together and don’t stop till your chest is level with your hands. Your body must remain straight at all times. At the top squeeze your blades and imagine trying to hold a tennis ball between them and then slowly lower your body, keeping it completely straight.