Stand on the sled platform with your shoulders positioned against the pads and feet about shoulder-width apart. Unlock the sled and slowly lower your body by bending your knees and hips, keeping your chest upright and back neutral. Descend until your thighs are roughly parallel or deeper depending on mobility. Push through your heels to extend your legs and return to the starting position in a controlled motion without locking out your knees. Repeat for the desired reps while maintaining steady tension throughout.
Log your sled hack squat sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.