While seated on the leg press, adjust your feet however you like (shoulder-width, wider, closer) depending upon which leg muscles you want to emphasize. Drive forward with your legs until the safety brackets can be released. Slowly bend the knees and lower the weight until your thighs hit the top of your chest (make it a full range of motion). Forcefully drive your legs forward and push your legs to the starting position. Never lock your knees out at the top of the movement as this can cause injury.