Before getting started, add weight to the machine. 25-35 pound plates on each side is a good starting point. If this is too heavy or too light feel free to adjust the weight.
Sit on the seat and place your feet hips-width apart on the footplate.
Once your feet are in place, press the footplate with both feet as you simultaneously disengage the safety latches on the side of the seat with your hands.
With your feet still on the footplate, bend your knees letting the footplate come toward your body. Once your knees are at a 90-degree angle, press the footplate up and straighten your legs. Be sure not to lock your knees.
This counts as one rep.
Once you've completed a set, press the footplate and engage the safety latches.