Barbell Back Squat

The barbell back squat is the foundational lower-body strength lift, and for good reason: few movements load the quads, glutes, and core as effectively in one rep. With the bar racked across your upper traps, you can progressively overload heavier than almost any other free-weight leg exercise, which makes the back squat a cornerstone for building leg size, raw strength, and full-body stability.

It is rated advanced because the barbell sits on your back, demanding solid bracing, ankle and hip mobility, and clean bar-path control before you load it heavy. Get the technique right, though, and the carryover to athleticism, posture, and every other lift is hard to match.

How to do the barbell back squat

1. Set the bar in the rack at roughly mid-chest height, grip it slightly wider than shoulder-width, and duck under so it rests across your upper traps (high-bar) or rear delts (low-bar) — never on the bony base of your neck.
2. Take a big breath, brace your core hard, and stand the bar out of the rack with your hips and knees. Step back with two or three controlled steps; do not walk the weight halfway across the gym.
3. Set your feet about shoulder-width apart with toes turned out 15 to 30 degrees, and screw your feet into the floor to create tension in the hips.
4. Take a deep breath into your belly, brace as if bracing for a punch, then break at the hips and knees at the same time to begin the descent.
5. Sit down and back, keeping your chest proud and your weight balanced over mid-foot, until your hip crease drops to at least parallel with the top of your knee.
6. Without bouncing, drive your feet through the floor and stand the bar up, pushing your knees out and squeezing your glutes as your hips and shoulders rise together.
7. Re-brace at the top, take a fresh breath if needed, and repeat for your target reps before walking the bar back into the rack.

Muscles worked

The barbell back squat is a quad-dominant compound lift. The quadriceps are the primary muscle, doing the heavy work of extending the knee to drive you out of the bottom — especially in a more upright, high-bar position. The glutes are the main secondary contributor, powering hip extension as you stand and locking out the top of the rep; they ramp up sharply the deeper you squat. The core — including the deep abdominals, obliques, and spinal erectors — works isometrically to keep your trunk rigid and protect the spine under load. The hamstrings, adductors, and calves assist as stabilizers, making the back squat one of the most complete lower-body movements you can train.

Benefits

• Builds maximal quad strength and size by loading the knee extensors under heavy, full-range tension
• Develops powerful glutes and hip drive that carry over to deadlifts, jumping, and sprinting
• Reinforces a braced, rigid core and stronger spinal stability under real load
• Allows heavier progressive overload than most leg exercises, accelerating long-term strength gains
• Improves ankle, hip, and trunk mobility while training balance and full-body coordination

Common mistakes

• Knees caving inward (valgus): consciously push your knees out in line with your toes and grip the floor with your feet to engage the glutes.
• Rounding the lower back ('butt wink' or spinal flexion): brace harder, limit depth to where you can keep a neutral spine, and address ankle or hip mobility.
• Hips rising first out of the bottom (the 'good-morning' squat): keep your chest up and drive hips and shoulders at the same rate — usually a sign the weight is too heavy or the core isn't braced.
• Cutting depth above parallel: control the descent and reach at least parallel so the quads and glutes are fully loaded; ego-loading shallow reps stalls progress.
• Letting weight shift onto the toes and heels lifting: keep pressure balanced across mid-foot and tripod through the heel and ball of the foot.
• Bar resting on the neck instead of muscle: rack it across your upper traps and pull your shoulder blades together to create a stable shelf.

Form tips

• Track your knees out over your toes throughout the rep — they should never collapse inward.
• Keep a proud chest and a hard-braced core from setup to lockout to protect your spine.
• Drive up through the mid-foot, feeling pressure across the whole foot rather than the toes or just the heels.
• Use the same big-breath-and-brace (Valsalva) on every rep, exhaling only near the top.
• Pick a focal point straight ahead or slightly down and keep your head in a neutral line with your spine.

Sets & reps

A classic strength template is 5 sets of 5 to 8 reps with about 3 minutes of rest, using a challenging but technically clean load. For pure strength and power, work in the lower 3 to 5 rep range at higher intensity with 3 to 5 minutes rest between sets. For hypertrophy (size), 3 to 4 sets of 8 to 12 reps with 90 seconds to 2 minutes rest hits the quads and glutes hard. For muscular endurance or technique practice, use 2 to 3 sets of 12 to 15 lighter reps. As an advanced, heavily loaded lift, prioritize flawless form over adding weight, and progress gradually.

Frequently asked questions