Box Squat
The box squat is a barbell back squat taken down to a box set at a chosen depth: you sit back to touch the box, pause briefly while staying tight, then stand up. The wide stance and near-vertical shins put more of the work on the hips, glutes and adductors, and the box fixes the same depth on every rep.
Also called: Sit-Back Squat · Equipment: barbell · Pattern: squat
Step by step
- Set a sturdy box or bench behind you at the depth you want to train, and set the bar in the rack at about mid-chest height.
- Step under the bar and place it across your upper back, on the muscle just below the base of your neck. Grip it firmly, squeeze your shoulder blades together and stand up to unrack it.
- Walk back until your heels are about a foot's length from the box. Take a stance clearly wider than shoulder width, with your toes turned out slightly.
- Take a big breath into your belly and brace your trunk hard before you move.
- Push your hips back and down while pressing your knees out, keeping your shins close to vertical and the bar over the middle of your foot.
- Sit onto the box with control until your glutes are fully on it. Pause for about a second with your breath held and your trunk and back still tight.
- Drive your feet into the floor and stand straight up from the box, bringing your hips forward and chest up together until your hips and knees are straight.
- After the last rep, walk the bar forward until it touches the uprights, then bend your knees to set it down into the hooks.
- Sit back to the box, touch and stay tight
- Shins vertical, knees pushed out
- Brace before you sit and stay braced on the box
- Bar over the middle of your foot
- Drive straight up, hips and chest together
In VALDA, these cues are one tap away on the exercise while you train.
What it trains
| Muscle | Role | Evidence |
|---|---|---|
| Gluteus maximus | Prime mover | B |
| Quadriceps: vastus lateralis | Prime mover | B |
| Quadriceps: vastus medialis | Prime mover | B |
| Adductors | Secondary | B |
| Erector spinae | Stabiliser | B |
| Hamstrings: biceps femoris (long head) | Stabiliser | C |
Evidence grades: A = strong research base · B = good · C = limited · D = coaching consensus.
What goes wrong, and the fix
Dropping onto the box
Fix: Sit back under control and touch the box softly, as if it might not be there.
Relaxing on the box
Fix: Keep your breath held and trunk braced for the whole pause on the box.
Rocking back to start the rise
Fix: Stand straight up from the box by driving your feet down, with no backward rock.
Knees drifting forward
Fix: Push your hips back first and keep your shins close to vertical on the way to the box.
Knees caving in on the rise
Fix: Press your knees out in line with your toes from the box to lockout.
Box set too low for your position
Fix: Set the box at the deepest height you reach with your back held flat.
What the research says
Strength · first choicePowerMuscle growthRehab & prehabGeneral fitnessSport performanceEnduranceFat loss & conditioning
- Load by goal — Research comparing loads finds maximal strength favours heavier loads (about 8 reps or fewer per set), while muscle growth is similar across a wide range of loads when sets are taken close to failure.
- Effort — Studies show strength gains are largely insensitive to how close to failure sets are taken, and training to failure gives no strength advantage on average. Many lifters keep heavy box squat sets a few reps short of failure.
- Box height — In a 10-week trial, full-depth squats built more glute and adductor muscle than half squats, with similar quadriceps growth, and strength gains were specific to the depth trained. The box height sets which of these each set trains.
- Rest — In trained lifters, rests of about 3 minutes between sets have produced greater strength and size gains than 1-minute rests.
- Speed sets — Some powerlifting programmes use light, fast box squats for technique and starting speed. There is no direct research comparing box squats with free squats for strength or muscle growth.
Swap it mid-workout
With VALDA Pro, FLEX offers alternatives like these when you swap an exercise mid-workout.
Log the box squat in VALDA, with these cues one tap away while you train and your history for it in one place.
General information about exercise technique, not medical advice. If you have an injury or a health condition, your healthcare provider is the right person to ask.