Purpose of Exercise: To develop mass in the thighs. Doing Leg Press allows you to press more weight with your legs without the pressure it puts on the lower back.
Execution: Sit down in the machine and place your feet on the platform. Foot position is relative to what part of your thigh you want to put the most stress on. Bend your knees and lower the weight as far as possible keeping tension on the thighs. Bring your knees to your shoulders if possible. Then press back up with your legs until your legs are fully extended. Do not use your hands to push on your knees or cross your arms across your chest. This limits the range of motion.