Sled Hack Squat
Description
The sled hack squat is a compound lower-body machine exercise where you squat under shoulder pads on an angled sled track with your back fully supported. The fixed path and back support remove the balance and spinal-stability demand of free-weight squats, allowing pure quad-dominant squatting with heavy weight. It is one of the best machines for building quad size.
Muscle Group
Equipment Required
Sled Hack Squat Instructions
- Step onto the hack squat machine and place your back flat against the pad. Position your shoulders under the shoulder pads.
- Place your feet on the platform shoulder-width apart. Lower foot positions bias the quads more; higher positions bias glutes more.
- Release the safety handles and straighten your legs to take the weight. Keep a slight bend in your knees at the top.
- Brace your core and keep your back pressed firmly against the pad throughout.
- Lower the sled by bending at the knees. Your knees should track over your toes.
- Descend until your thighs are at least parallel to the platform or deeper if your flexibility allows.
- Drive the sled back up by pressing through your full foot. Do not lock your knees at the top.
- Re-engage the safety handles before exiting.
Sled Hack Squat Form & Visual

Sled Hack Squat Benefits
- Allows heavy quad-dominant squatting with full back support
- Removes balance and spinal-stability demand
- Excellent for building quad size and strength
- Allows deep squatting safely with guided path
- Easy to train to failure with safety stops
- Useful for lifters with lower-back issues
Sled Hack Squat Muscles Worked
- Quadriceps (heavy emphasis)
- Gluteus maximus
- Hamstrings (secondary)
- Adductors
- Calves (secondary)
Sled Hack Squat Variations & Alternatives
- Barbell Hack Squat
- Smith Machine Hack Squat
- Landmine Hack Squat
- 45-Degree Leg Press
- Narrow-Stance Hack Squat (quad bias)
- Wide-Stance Hack Squat (glute bias)
- Single-Leg Hack Squat
- Reverse Hack Squat (face the pad)





