Setup
Stand in the hack squat machine, feet about shoulder width apart and nearly straight without locking them out, shoulders under the pads and hands gripping the safety handles. Squeeze your shoulder blades together and down and engage your core
Movement
Squat to down bending the knees, hips and ankles then drive back up through the balls of your feet to straighten your knees and return to the setup position.
Tips
Do not let your knees fall inward while descending or ascending.