Barbell Back Squat

What is the Barbell Back Squat?

The barbell back squat is the primary lower-body strength lift, loading the quads, glutes, and hamstrings under a bar carried across the upper back. It builds strength and muscle through a huge range of motion and carries over to almost every athletic and everyday lower-body task, which is why it anchors most strength programs.

Muscles worked

Primary: Quads

The quadriceps extend the knees to drive you up out of the bottom, the defining demand of the back squat.

Secondary: Glutes, Hamstrings

The glutes and hamstrings extend the hips to share the load, contributing more as you sit deeper and drive out of the hole.

Stabilizers

The spinal erectors and the whole braced trunk keep the torso rigid under the bar, while the adductors help control the knees.

How to perform the Barbell Back Squat

1. Set the bar in the rack just below shoulder height; duck under it and place it either on the upper traps (high bar) or on the rear delts across the spine of the scapula (low bar).
2. Grip the bar evenly outside shoulder width to create a shelf with the upper back; squeeze the elbows down and the chest up.
3. Unrack the bar with both feet under it, take two or three steps back to clear the rack, and set your feet roughly shoulder-width with toes slightly turned out.
4. Take a deep breath into your belly, brace your core hard, then break at the hips and knees simultaneously, sitting between your legs rather than pushing the hips straight back.
5. Descend until your hip crease is at or below the top of the knee, keeping the knees tracking over your toes and the bar path vertical over the mid-foot.
6. Drive up by pushing your feet through the floor and standing tall; lead with the chest and the hips rising together, not the hips shooting up first.
7. Re-rack only when both feet are under the bar and you are walking forward into the J-hooks. Never let go until the bar is fully seated.

Suggested working range: 5–8 reps. Default progression: double progression.

Mechanics

A bilateral squat pattern: the hips and knees bend together to lower the body between the legs, then extend together to stand back up. As a heavy compound it moves the knees, hips, and ankles through a large range while the spine stays rigid, which is why it trains so much muscle at once.

Form cues

• •Brace hard against a big breath before you descend, and hold it until you’re back up.
• •Break at the hips and knees together, sitting down between your legs rather than folding forward.
• •Drive your knees out in line with your toes so they don’t cave inward.
• •Descend to at least parallel (hip crease at knee height) if your mobility allows, keeping the heels planted.

Common mistakes

• •Letting the knees cave inward (valgus collapse) at the bottom or during the drive out of the hole.
• •Shooting the hips up first out of the bottom so the torso pitches forward and the squat turns into a good morning.
• •Cutting depth short by a quarter or half squat instead of breaking parallel.
• •Letting the heels lift off the floor at the bottom, usually a sign of ankle mobility limitations or a too-narrow stance.
• •Letting the chest drop and the upper back round under heavy load.

Variations & alternatives

• •Front squat: the bar on the front of the shoulders shifts emphasis toward the quads and a more upright torso.
• •Leg press: a machine alternative that trains the quads and glutes with far less balance and bracing demand.
• •Bulgarian split squat: a single-leg variation that builds each leg independently and spares the spine.
• •Goblet squat: holding a single weight at the chest, an easy way to learn the pattern.

Leg Press

Quads · Machine

Bulgarian Split Squat

Quads · Dumbbell

Goblet Squat

Quads · Dumbbell

Leg Extension

Quads · Machine

Front Squat

Quads · Barbell

Programming: sets, reps & when to use it

The back squat is usually the first movement of a lower-body session, trained heavy in the library’s 5–8 rep range for strength, or extended into 8–12 for more hypertrophy volume on a lighter day. Because it is fatiguing, most lifters squat heavy one to two times a week and let recovery guide the volume.

Frequently asked questions