ProgreviaBack squat: proper form, muscles worked and common mistakes
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How to do it
Bar on the traps, feet shoulder-width with toes slightly out. Sit down and back driving the knees out until you break parallel, keeping a neutral spine and braced core.
Muscles worked
Main muscle: quads. Also worked: glutes and hamstrings. When it plans weekly volume, the generator counts each set of this exercise as one full set for quads and half a set for each secondary muscle (what is known as fractional counting).
Back squat vs. paused squat: the bounce changes everything
In the back squat, when you reach the bottom you come straight back up and use the elastic rebound out of the hole. That lets you move more weight, and it's why this is the version used to measure leg strength. The paused squat kills that rebound and makes you start from a dead stop, with less load. Compared with the front squat, the bar sits behind you, which allows more torso lean, more hip drive and heavier loads. And compared with the leg press or the hack squat, here you hold the bar and your trunk works throughout, with more fatigue in your back and your body as a whole.
It's the base lift of leg day: put it first, while you're fresh, in a rack with the safeties at the right height. If you're new to it, start with the goblet squat and move to the bar once the pattern is solid. Work sets of 3 to 8 reps for strength and 8 to 12 for volume, always leaving reps in reserve, and add weight in small jumps.
Bar position changes the movement: high on the traps it keeps the torso more upright and asks more of the quads; low, resting on the rear delts, it leans the torso more and brings in more hips. Pick one and stay with it for several weeks.
Technical sheet
- Movement pattern
- Squat
- Minimum level
- Intermediate
- Technical demand
- Needs coaching
- Fatigue it generates
- Very high (2 out of 2.2)
- Risk if technique breaks down
- Medium
- Peak tension in the stretched position
These are the values the generator uses to decide where the exercise goes within the session.
Recommended sets and reps
As a compound lift, it fits in 3–5 sets of 5–12 reps leaving 1–3 reps in reserve (RIR). Prioritize it at the start of the session, when you're fresh.
Common mistakes to avoid
- Letting the knees cave inward (valgus) when pushing, instead of keeping them tracking over the feet.
- Gripping the bar with each hand at a different distance from the center: one side works harder without you noticing.
- Cutting short the part of the range where the muscle is stretched: that is exactly where this exercise gives the most stimulus.
What the research says
This is a multi-joint lift, and with these the rep range matters less than it seems: Schoenfeld and colleagues (2021) concluded that muscle growth is similar with heavy or moderate loads as long as sets end close to failure, while maximal strength improves more with heavy loads.
Its peak tension comes with the muscle stretched, and that matters: in the trial by Maeo and colleagues (2021), seated leg curls, which stretch the hamstrings more, built more muscle than lying curls, and Pedrosa and colleagues (2022) saw something similar in the quads when training the long end of the range.
You do not need to reach failure on every set: according to the meta-analysis by Refalo and colleagues (2023), stopping one or two reps short gives very similar growth. The generator prescribes it with RIR for that reason.
- Schoenfeld BJ, Grgic J, Van Every DW, Plotkin DL. Loading recommendations for muscle strength, hypertrophy, and local endurance: a re-examination of the repetition continuum. Sports. 2021;9(2):32.
- Maeo S, Huang M, Wu Y, et al. Greater hamstrings muscle hypertrophy but similar damage protection after training at long versus short muscle lengths. Medicine & Science in Sports & Exercise. 2021;53(4):825-837.
- Pedrosa GF, Lima FV, Schoenfeld BJ, et al. Partial range of motion training elicits favorable improvements in muscular adaptations when carried out at long muscle lengths. European Journal of Sport Science. 2022;22(8):1250-1260.
- Refalo MC, Helms ER, Trexler ET, Hamilton DL, Fyfe JJ. Influence of resistance training proximity-to-failure on skeletal muscle hypertrophy: a systematic review with meta-analysis. Sports Medicine. 2023;53(3):649-665.
How Back squat compares with other quads exercises
Of the 16 quads exercises in the catalogue, ranked from least to most fatiguing by the values the generator uses, Back squat is number 16.
With that fatigue it is best placed early in the session, while you are fresh, without stacking equally demanding exercises for the same group after it.
With different equipment, the same movement pattern offers 10 alternatives, such as Goblet squat, Dumbbell step-up and Static lunge.
| Exercise | Equipment | Fatigue | Technique |
|---|---|---|---|
| Box jump | bodyweight | High (1.3 out of 2.2) | Needs coaching |
| Cyclist squat | dumbbells | High (1.3 out of 2.2) | Needs coaching |
| Bulgarian split squat | dumbbells | High (1.4 out of 2.2) | Needs coaching |
| Hack squat | machine | High (1.5 out of 2.2) | Needs coaching |
| Sumo barbell squat | barbell | Very high (1.8 out of 2.2) | Needs coaching |
| Paused squat | barbell | Very high (1.9 out of 2.2) | Needs coaching |
| Front squat | barbell | Very high (1.9 out of 2.2) | Advanced |
| Back squat | barbell | Very high (2 out of 2.2) | Needs coaching |
Tension with the muscle stretched. Back squat loads the muscle when it is longest. In the review by Kassiano et al. (2023), across eleven studies, full range of motion and partials performed in the initial part of the movement — with the muscle long — produced more growth than partials performed at the end.
- Kassiano W, Costa B, Nunes JP, Ribeiro AS, Schoenfeld BJ, Cyrino ES. Which ROMs lead to Rome? A systematic review of the effects of range of motion on muscle hypertrophy. Journal of Strength and Conditioning Research. 2023;37(5):1135-1144.
Related guide
Barbell squat technique and its most common errors
Alternative exercises
More squat exercises
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Frequently asked questions
What muscles does Back squat work?
Back squat mainly works the quads muscle group, plus synergist and stabilizer muscles depending on the variation.
How many sets of Back squat should I do?
Between 3 and 5 sets per session, adjusting the total weekly volume for quads to your level (about 10–20 sets per muscle per week).
How deep should I go on the back squat?
Ideally as deep as your mobility lets you go while keeping a neutral back and without your pelvis tucking under at the bottom. Breaking parallel is a good goal, but if your hips or ankles don't get you there, go down as far as you can control and build range a little at a time.
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