HOW: Sitting in the leg press machine, move the seat back as far as possible. Ideally, you want to start with as much knee straightening as possible. Toes are facing up toward the ceiling.
Use the arms to stabilize the upper body and core. Remove one leg off of the leg press plate. Press the machine as far away as you can so that your knee is straight for your starting position.. Point and flex back and forth with the ankles. Bring the other leg back on and switch sides.
Repeat for the prescribed repetitions.
FEEL: You should feel the back of the lower leg. Feel more tension at the top position and more stretch at the bottom. Can also feel work in the toes and feet.
COMPENSATION: Do not let the knees bend. Do not let the legs rotate in or out.