Sitting on a leg press machine, position your feet together against the crosspiece about should-width apart and toes pointed slightly outward. Grasp the handle grips or sides of the seat. Bend your knees and lower the weight as far as possible without changing the position of your hips. Do not lower the weight so far that your hips start to curl up off the seat! Then slowly push the weight back up using your heels, not your toes. Do not lock your knees at the top, but rather take the weight to just before lock. Then being to lower the weight again SLOWLY. You can change your foot positions to vary the angle on the muscle.