Squat form: setup, depth and the common faults

The squat is the lower-body lift many plans are built around. Common problems include a setup that skips a step, depth that shrinks as the weight climbs, heels that come off the floor. This page covers the setup step by step, how deep to squat, whether your knees can go past your toes, the barbell, dumbbell and machine versions, and the faults worth watching for.

Brand new to lifting? The first four weeks starts with a goblet squat or a leg press, and this page is the next step.

The setup, step by step

These are the checkpoints for a barbell back squat. The dumbbell and machine versions further down use the same ones, minus the rack.

1. Set the bar at about upper-chest height in the rack, so you can lift it off with a small knee bend rather than on your toes.
2. Get under it. The bar rests on your upper back, either high on the top of the shoulders or a few inches lower (the two positions are compared below). Hands just outside your shoulders.
3. Stand it up and take two or three short steps back.
4. Feet about shoulder-width apart, toes turned out a little. Adjust until the bottom position feels balanced; there's no single correct width.
5. Breathe in and brace. A big breath, then tighten your midsection as if you were about to be poked in the stomach. Do it before every rep.
6. Sit down between your heels. Hips and knees bend together, your knees travel in the direction your toes point, your whole foot stays on the floor, and the bar stays over the middle of your foot.
7. Stand up the same way, with your chest and hips rising together, and breathe at the top.

Then film a set from the side, about level with your hips. Most of the faults below are easier to see on video than to feel mid-rep.

How deep to squat

As deep as you can control. The research on range of motion points one way:

• The reviews. A 2021 meta-analysis of 16 studies found that training through a full range of motion built more strength and more lower-body muscle than partial reps.¹ A 2020 systematic review of six studies (135 people, 127 of them men) found similar or greater lower-body muscle gains with full range of motion and called the evidence for the upper body limited and conflicting.² The American College of Sports Medicine's 2026 position stand found that a complete range of motion enhanced strength, but too little data to say whether it changed muscle growth.³
• Deep vs shallow squats. In a 12-week trial, 17 male students squatted either deep (knees bent to 120 degrees) or shallow (to 60 degrees). The deep group's front-thigh muscle grew more.⁴
• Full vs half squats. In a 10-week trial, 17 men squatted twice a week, either full or half squats. The front of the thigh grew about the same in both groups, but the full-squat group's glutes and inner-thigh muscles grew more, and neither group's hamstrings grew.⁵

Those two trials are small and in men only, so read them as a direction, not a rule. A practical target: thighs at least parallel to the floor, and deeper if you can keep your heels down, your back in the position you set, and the bar over your feet. And since squats didn't grow the hamstrings in that last trial, a week of training needs a hinge as well: that's deadlift form.

Can your knees go past your toes?

Usually, yes. The old advice was to keep your shins vertical so your knees never pass your toes. In a small study of seven weight-trained men, blocking the knees from moving forward lowered the turning force (torque) at the knee by about a fifth but raised it at the hip about tenfold, and made the lifters lean further forward. The authors concluded that the knees may need to move slightly past the toes.⁶ A common cue is to keep your knees following your toes, not caving in toward each other.

Barbell, dumbbell and machine versions

Each version below is the same movement with the weight in a different place, and the placement changes how upright you stay.

The first two rows come from a 2017 review of high-bar and low-bar squats, which describes lifters moving differently to keep their center of mass over their feet: with the bar lower on the back, the torso leans further forward to balance it.⁷ In a study of 18 recreationally trained lifters (nine men, nine women), a low bar with a wide stance put more of the work on the hips, while a high bar with a narrow stance put more on the knees, with more front-thigh and less glute activity.⁸

For the front squat, a study of 15 healthy trained people found it as effective as the back squat in overall muscle recruitment.⁹ For the Smith machine, a study of six people found average muscle activity across seven leg and trunk muscles was 43% higher in the free-weight squat, each done at an eight-rep max.¹⁰ Six people is a very small sample, so take it as a hint. The goblet squat is the home version, and the three-day dumbbell plan opens Day A with it. Pick the version your gym has and you can do with clean positions, and keep it for a while.

Stance width, and squats for glutes

A wider stance and a lower bar shift the squat toward the hips, as the study above found. For the glutes specifically, depth has the stronger evidence. In the full-versus-half trial, the glutes grew about three times as much with full squats (6.7% vs 2.2%).⁵ That's growth measured over ten weeks; the stance study measured muscle activity during the lift itself, which is a weaker guide to what grows. So a squat for the glutes is a deep squat first and a wide one second. For the front of the thigh, a high bar and a narrower stance lean the other way.

The common faults, and a fix for each

• Knees caving in. On the way up, the knees drift toward each other. Push your knees out in the direction of your toes, and lighten the load until they stay there.
• Heels lifting. The weight drifts onto your toes. Sit down between your heels rather than forward over your toes, and try a slightly wider stance.
• The chest dropping on the way up. The hips rise first and the squat turns into a lean-over. Rebrace before each rep, drive your chest and hips up together, and drop the weight if it keeps happening.
• Depth that shrinks as the weight climbs. Keep the depth and let the weight wait; the reviews above favor the full range.
• Grinding every set to the last rep. A 2025 review of 22 studies in experienced lifters (293 people) found that heavier loads were consistently linked to a slower bar and more variable joint movement, and fatigue slowed the bar too.¹¹ Keep two or three reps in reserve on heavy squats. (Here's how to judge reps left.)
• Squatting through pain. Sharp pain is not soreness. Stop, and see a doctor or a physical therapist.

Sore the day after your first squat sessions? Muscle soreness covers whether to train through it. The same step-by-step approach covers the upper body in bench press form and how to do a pull-up.

If you'd rather not plan it alone

A page can list the checkpoints. Choosing which squat fits your gym and your week, and how heavy each session should be, is the part it can't do. Coaching is the version where your workouts live in the Trainerize app, built around the days you actually have, and a weekly call looks at the week you just had and rebuilds the next one. Coaching to build muscle explains how that works, and here's how to apply. Otherwise: film one set from the side this week and check it against the seven steps.