Stand on the sled platform with your shoulders pressed firmly against the pads and your back supported. Place your feet about shoulder-width apart and slightly forward on the platform. Unlock the sled and slowly lower your body by bending your knees and hips while keeping your chest upright and core braced. Descend under control until your thighs reach at least parallel, ensuring your knees track in line with your toes. Push through your heels to extend your legs and drive the sled back up to the starting position without locking out your knees. Repeat for the desired reps with smooth, controlled motion.
Log your sled full hack squat sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.