Box Squat: How to Do It, Box Height and Benefits

The box squat is a barbell back squat where you sit back onto a box or bench at a set depth, pause briefly while staying tight, then stand up. The box takes the guesswork out of depth and makes you sit your hips back rather than shoving your knees forward. Powerlifters use it to build strength out of the bottom, and beginners like it because a box behind you is reassuring under a loaded bar. Done badly, though, it turns into a controlled fall onto a hard surface, which is where most of the bad reputation comes from.

How to do a box squat

You'll need a squat rack or power cage, a barbell and a box or bench that won't slide. Set the safety pins or spotter arms just below the depth the box gives you, so that if a rep goes wrong the bar lands on steel rather than on you.

1. Place the box. Unrack an empty bar, stand in your squat stance and have the box roughly 20cm to 30cm behind your heels. Sit back to check it: your bum should land in the middle of the box, not on the front edge.
2. Unrack and walk out. Set the bar on your upper back as you would for a back squat, step back until the box is just behind your calves, and set your feet. Most people take a stance a little wider than their normal squat.
3. Brace. Big breath into your belly, ribs down, upper back squeezed into the bar.
4. Sit back and down. Push your hips back first, then bend the knees, keeping your shins close to vertical and your knees pushed out over your toes. Lower under control the whole way.
5. Sit, don't flop. Let your bum land softly and hold for about a second. Your hip flexors can relax a touch, but your trunk, lats and upper back stay locked.
6. Drive up. Push your feet into the floor, lead with your chest and hips together, and stand straight up off the box without rocking.

Box height: parallel or just above

Set the box so that, when you're sitting on it, your hip crease is level with or a couple of centimetres above the top of your knee. That's parallel in powerlifting terms. A standard flat weight bench is around 42cm to 45cm high, which lands close to parallel for many people around 170cm to 180cm tall; taller lifters often need to raise it with a firm mat or stacked plates.

Going above parallel is fine when you're learning or deliberately overloading the top half of the squat. Going below parallel is where people get hurt. If your pelvis tucks under and your lower back rounds to reach the box, it's too low, and the box will cheerfully let you load that rounded position every rep. Raise it until you can sit with a neutral spine, then lower it over weeks as your mobility allows.

Sit-back or touch-and-go?

These are two different exercises sharing a name.

Sit-back (paused) box squat. You sit fully, pause a second, then stand. The pause kills most of the stretch reflex, so you're producing force from a near standstill. A study of eight trained lifters found peak force and power were similar between a normal squat and a box squat at 60% to 80% of their max, and muscle activity was generally a little higher in the normal squat. In practice that means the box squat is a solid strength builder, not a magic one.

Touch-and-go. You brush the box and reverse without unweighting. It keeps the rhythm of a normal squat and works as a depth check, which suits lifters who tend to cut depth as weight goes up. The risk is that a "touch" quietly becomes a bounce.

New to the lift? Start with the sit-back version.

Wide vs normal stance

The classic powerlifting box squat uses a wide stance with the shins near vertical. In a biomechanics comparison by Swinton and colleagues, powerlifters box squatted with a stance of about 92cm against about 48cm for a traditional squat, kept their shins more upright, and produced the smallest peak moments at the spine and ankle of the three squats tested. The hip, not the knee, did a larger share of the work.

The wide stance suits mobile hips. If yours are stiff, a stance just outside shoulder width with toes turned out 15 to 30 degrees works fine; you'll get a bit more quad and a bit less glute and adductor.

Muscles worked

• Glutes and hamstrings. Sitting back puts the hips further behind the bar, so the hip extensors drive more of the lift than in a knee-forward squat.
• Adductors. The inner thighs work hard, especially with a wide stance and when starting from the paused position.
• Quads. Still heavily involved, just not as dominant as in a goblet squat or front squat.
• Spinal erectors and trunk. Holding a braced position on the box and re-tensioning before the drive is as much a core exercise as anything in a sit-up routine.

Benefits

It teaches consistent depth. You know exactly where the bottom is every rep, which is useful for anyone who drifts higher as the weight gets heavier.

It drills a hip-dominant pattern. Lifters who squat by pushing their knees far forward and folding at the ankles often have no idea what "sit back" feels like. The box shows them.

It may suit cranky knees. The more vertical shin keeps the knees further back, and in the Swinton work the box squat produced lower peak moments at the ankle and spine than the traditional squat. Nobody has shown it fixes knee problems, so treat it as a sensible variation to try rather than therapy, and see a physio if pain persists.

It builds confidence. A box under you makes the bottom of a loaded squat far less intimidating when you train alone.

The NHS recommends strength work on at least two days a week covering the legs and hips, and the box squat fits neatly into that as either your main squat or a second-day variation.

Common mistakes

Crashing onto the box. Dropping the last 10cm compresses your spine under load. If you can hear the landing, slow down.

Rocking back and forward. Leaning back on the box then rocking forward to build momentum shifts load onto your lower back and turns the lift into a swing. Stand up the way you sat down.

Losing tension on the box. Exhaling and slumping during the pause leaves you trying to brace with a heavy bar already pinning you. Hold your breath and your brace until you're upright again.

Box too low. The most common fault of all. Raise it until your lower back stays neutral, and make sure the box is solid and can't skid on your flooring.

Variations

Goblet box squat. Hold a dumbbell or kettlebell at your chest and sit to a box. It's the best way to learn the pattern before you put a bar on your back.

Dumbbell box squat. Hold a dumbbell in each hand by your sides. Handy for higher reps when you don't have a rack, though grip often gives out before the legs.

Anderson or pin squat. Swap the box for the safety pins in a rack and pause the bar on them instead. Our pin squat guide covers pin height and the dead stop.

Bench as box. If you don't own a plyo box, a sturdy flat bench works, provided it's the right height and stays put.

Programming

As a main lift, work up to 3 to 5 sets of 3 to 5 reps at a weight you could manage for one or two more clean reps, once or twice a week. As an accessory after normal squats, 3 sets of 5 to 8 reps at around 60% to 70% of your squat working weight is plenty. Beginners learning the pattern can do 3 sets of 8 with a goblet box squat for a few weeks before moving to the barbell.

Add 2.5kg to 5kg once every set hits the top of the rep range with soft landings and no rocking. Every few weeks, lower the box a little if your depth and back position allow it.

What you need

You need a rack with adjustable safety arms to catch the bar. Our best squat rack UK guide covers stand-alone racks and half racks, and the best power cage UK guide covers full cages. If you're on a budget, the Ultrasport Power Rack review looks at a cheap cage with spotter arms.

Recommended reads

• Back squat: how to do it properly
• Pin squat guide
• Goblet squat guide
• The best squat racks in the UK
• Ultrasport Power Rack review