What is a Squat (Exercise)
The squat is a foundational compound lower-body exercise that targets the quadriceps, hamstrings, glutes, and core — widely considered one of the most effective movements in any strength or fitness program.
The squat is a compound exercise that involves bending at the knees and hips to lower the body toward the ground and then returning to a standing position. It is one of the most fundamental human movement patterns and one of the most effective exercises for building strength, power, and muscle in the lower body.
Squats can be performed with bodyweight, a barbell, dumbbells, a kettlebell, or other resistance. The barbell back squat — loaded with weight across the upper back — is the most common version in strength training programs and one of the three powerlifting competition lifts.
Primary Muscles Worked
| Muscle Group | Role |
|---|---|
| Quadriceps | Primary mover — extends the knee |
| Glutes (gluteus maximus) | Powerful hip extension |
| Hamstrings | Assist at the hip; eccentric stabilization |
| Adductors | Inner thigh stabilization through the movement |
| Core / erector spinae | Stabilize the spine under load |
| Calves | Ankle stability |
The squat's multi-joint nature is why it develops such significant muscle mass and strength across the entire lower body simultaneously.
How to Perform a Barbell Back Squat
- Setup — Bar rests on the upper traps (high bar) or across the rear delts (low bar). Feet roughly shoulder-width apart, toes turned out slightly
- Descent — Push knees out and in line with toes; sit hips back and down; keep chest up and spine neutral; descend until thighs are at least parallel to the floor
- Bottom position — Brief pause or near-pause; maintain tension throughout
- Ascent — Drive through the heels, push the floor away, extend hips and knees simultaneously
Common cues: "Knees out," "chest up," "drive the floor away," "stay tight"
Squat Variations
| Variation | Primary Difference | Best For |
|---|---|---|
| Back squat (high bar) | Bar on upper traps; more upright torso | Quads, general strength |
| Back squat (low bar) | Bar across rear delts; more forward lean | Powerlifting, posterior chain |
| Front squat | Bar on front delts; very upright torso | Quads, Olympic lifting |
| Goblet squat | Dumbbell or kettlebell held at chest | Beginners, technique learning |
| Bulgarian split squat | Rear foot elevated, single-leg variation | Unilateral strength, glutes |
| Box squat | Squat to a box; controlled descent | Posterior chain emphasis |
Squat Depth
"Parallel" — thighs parallel to the floor — is the minimum standard depth in most strength training. Below parallel (often called "ATG" — ass to the grass) increases the range of motion and muscular demand. Shallow squats ("quarter squats") significantly reduce mechanical demand and muscle development, limiting training stimulus.
Depth is limited by mobility, specifically ankle dorsiflexion and hip mobility. Foam rolling and ankle stretches can progressively improve range of motion.
Programming the Squat
The squat pairs naturally with upper-body compound exercises like the bench press (bench press) and deadlift in full-body or upper/lower splits.
| Goal | Sets × Reps | Intensity |
|---|---|---|
| Max strength | 3–5 × 3–6 | 80–90%+ of 1RM |
| Hypertrophy | 3–4 × 8–12 | 65–80% of 1RM |
| Muscular endurance | 2–3 × 15–20 | 50–65% of 1RM |
Progressive Overload in the Squat
The squat responds extremely well to progressive overload — systematically increasing weight or volume over time. Even small consistent increases (2.5 lb per session when possible) compound significantly over months and years. Tracking your squat numbers is one of the clearest indicators of overall strength progress.
For beginners, linear progression programs like Starting Strength, StrongLifts 5×5, or GZCLP are designed around the squat as a primary lift and allow for consistent progression over many months.