the squat is a compound lower-body movement that trains your quads, hamstrings, glutes, and core together in one rep. the basic movement: stand with a barbell across your upper back, push your hips back and down until your thighs reach parallel to the floor, then stand back up.
the form details below determine whether you're loading those muscles effectively or just bending under a bar.
setup
get four things right before you unrack.
bar position. the bar sits across your upper traps, just below the base of your neck. this is called high bar. there's also low bar, where the bar sits a few inches lower across your rear delts and requires a more aggressive forward lean. high bar is easier to learn and a better starting point. hands grip just outside shoulder width, elbows angled slightly behind the bar.
stance. feet shoulder-width apart, toes pointed out 15 to 30 degrees. the exact angle varies by body. find the one where your knees can travel out over your toes without your heels lifting. that's your squat stance.
brace. before you unrack, take a deep breath into your belly. squeeze your core hard. this creates intra-abdominal pressure that stabilizes your spine under load. hold the brace through the descent and the drive. release at the top, breathe, brace again before the next rep.
unrack and step back. take two short steps back from the rack. find your foot position, brace again, then begin.
the movement
descent
push your hips back and down at the same time. your knees travel forward and out in the direction of your toes. your torso will lean forward. a 15 to 30-degree lean from vertical is a normal part of the squat.
keep your weight distributed evenly through your whole foot, heel to toe. if your heels start to rise, the weight has shifted too far forward.
the bottom
your hip crease should reach at or below the height of your knee. that's parallel. the bottom position should feel loaded in your quads and glutes. stay braced and begin the drive immediately.
the drive
push the floor away. your hips and shoulders rise together. if your hips shoot up while the bar stays low, the load transfers to your lower back instead of your legs.
drive your knees out as you rise. stand tall at the top. that's one rep.
how deep to squat
parallel is the right starting target. your hip crease should reach knee height or below on every rep.
going below parallel trains the quads through a longer range of motion. research shows that deeper squats produce greater development in the quadriceps compared to partial squats. the practical difference is real but modest. getting to parallel consistently matters more than the exact depth.
quarter squats, where you barely descend, are a different exercise. the muscles get a fraction of the work. if you're stopping well above parallel because the weight is too heavy, drop the weight. if limited mobility is the reason, that's worth working on over time.
common mistakes
knees caving in
your knees drift inward during the descent or the drive. this is called knee valgus. it usually means the load is ahead of your current control, or the stance is too narrow.
fix: think about pushing your knees out toward your small toes throughout the movement. widen your stance slightly if it continues. drop the weight until you own the position.
heels rising
your heels leave the floor as you descend. weight shifts to your toes. this usually means the hips aren't going back far enough, or ankle mobility is limited.
fix: actively drive your heels into the floor. for beginners with tight ankles, placing a weight plate under each heel can help while you build flexibility. the plate is a temporary tool. the goal over time is squatting flat-footed.
hips shooting up
at the bottom, your hips rise faster than your shoulders. the bar trails behind. this transfers the load to your lower back and takes the legs out of the drive.
fix: think of the drive as a leg press. your hips and shoulders are a single unit coming up together. focus on pressing the floor away from under you.
cutting depth short
stopping above parallel and adding weight to that incomplete rep. the muscles aren't trained through their full range, and progress built on a short range stalls out.
fix: slow your descent, own the bottom position, then add weight.
footwear
flat shoes work best for squatting. a flat sneaker puts you in direct contact with the floor. a running shoe with a thick foam midsole creates a spongy surface between you and the ground, making it harder to brace and drive effectively.
most flat sneakers work fine (Converse, Vans, basic cross-trainers). purpose-built weightlifting shoes have a small heel raise that helps with squat depth if ankle mobility is the limiting factor. they're worth considering after several months of consistent squatting.
warm-up sets
before your first heavy squat set, do 2 to 3 warm-up sets with progressively increasing load. if your working weight is 135 lb, a simple ladder looks like: bar only, then 65 lb, then 95 lb, then your first working set. each set warms up the joints, reinforces the movement pattern, and prepares your muscles for the load ahead.
for the full warm-up structure before any lifting session, see how to warm up before lifting.
how to progress
add weight once you hit every rep in every set cleanly. for squats, 5 to 10 pounds per session is a reasonable starting jump. squats can take larger increments than upper-body lifts because of the muscle mass involved.
when weight jumps slow down, add reps before adding weight. the underlying principle is the same either way: the training has to get harder over time for your body to keep adapting. for the full breakdown, see what is progressive overload?.
Arc logs your squat sets and tracks your performance. when your recent sets show you're ready to move up, Arc suggests the next weight for your upcoming session. you still do the work. Arc tells you when to push.
sources
- bloomquist, k., langberg, h., karlsen, s., madsgaard, s., boesen, m., & raastad, t. (2013). effect of range of motion in heavy load squatting on muscle and tendon adaptations. european journal of applied physiology, 113(8), 2133-2142. pubmed.ncbi.nlm.nih.gov/23604798
track the squat. build from there.
Arc logs your lifts and tells you when to add weight. free to download.
