How to do the Hack Squat (Machine)

Set your shoulders under the pads, place your back against the support, and plant feet on the platform.
Position your feet around shoulder width with toes slightly turned out if that matches your hip mechanics.
Release the safeties and stand tall with knees soft, not fully locked.
Brace your trunk and keep your hips and shoulders in contact with the pad.
Lower by bending your knees and hips until your thighs reach your deepest controlled position.
Keep your knees tracking over your toes and your full foot pressed into the platform.
Drive the platform away by extending your knees and hips to return to the top.
Stop just short of a hard lockout before starting the next rep.