Machine Leg Curl
This is a basic but effective exercise that promotes the development of the hamstrings.
STEP 1. Lay face down on the machine, with its leg pad just above your heels and make sure that your knees line up with its pivot points.
STEP 2. Slowly exhale and pull your heels toward your hips, flexing your knees as much as you need to for comfort.
STEP 3. When you have moved as far as you can without any sense of straining, inhale and slowly return your heels to the starting position.