I shoot gym content for a living, which means I watch people squat all day. The same five errors come up across every demographic, every body type, and every level of experience. Most of them are small enough that the lifter does not feel them until something starts to hurt. By the time it hurts, the pattern has been baked in for thousands of reps. Fixing the form before pain shows up is the entire game.
The first error is the knees caving inward at the bottom of the squat. The technical term is valgus collapse, and it shows up the moment the lifter starts to drive out of the hole. You can spot it from any angle. The knees track inside the line of the toes, the femur rotates internally, and the load on the medial knee structures spikes. Cueing wider stance helps a little. What helps more is a band around the knees during warm-up sets to teach the lifter to actively push the knees out against resistance. Two weeks of that drill before working sets corrects most cases.
The second error is the back rounding under the bar before the lifter is anywhere near a max. This is almost always a bracing problem, not a flexibility problem. The lifter takes a shallow chest breath, unracks the bar, and the spine has nothing holding it stiff against the load. The fix is a real Valsalva brace. Big breath into the belly, not the chest, push the breath against a tight core like you are about to take a punch, then walk the bar out. The brace has to be set before the descent begins. Adjusting it on the way down is too late.
The third error is the hips shooting up faster than the chest on the ascent. This makes the squat into something closer to a stiff-legged good morning, and the bar effectively gets transferred from the legs to the lower back. You can usually hear it before you can see it. The lifter grunts harder than they should, and the chest dips forward under the load. The cause is almost always weak quads relative to the posterior chain. Front squats and pause squats at parallel for six to eight weeks rebuild the missing strength. Trying to fix it with cues alone does not work because the body will always send the load to whichever muscle is strongest.
The fourth error is heel rise. The heels lift off the platform during the descent, the weight shifts forward onto the toes, and the lower back compensates by tipping the chest down. Sometimes the cause is genuine ankle restriction. More often the cause is shoes with thick cushioning that compress under load and tip the lifter onto the forefoot. Flat-soled shoes solve about eighty percent of these cases. Converse Chuck Taylors are the cheap option at sixty-five dollars. A real lifting shoe with a hard sole and a small heel block is the upgrade. If the heel rise persists in flat shoes, then ankle mobility work is the next layer.
The fifth error is the depth question, which goes both directions. Half of lifters never break parallel, and the other half let the bar dump them into a deep bottom they cannot control. Both are wrong. Parallel means the crease of the hip is level with the top of the kneecap. Below parallel is fine if you can hold a flat back at that depth. If your back rounds in the bottom inch, you have just found your real depth, and that is where the rep should turn around. Filming yourself from the side with a phone propped on a plate is the cheapest coaching tool that exists. Most lifters cannot tell what their squat is doing without seeing it.
A coach helps. If you are training without one, two hundred dollars on a single session with a strength coach who has been running barbells for a decade will do more for your squat than another year of YouTube videos. They will catch things in five minutes that you have been missing for a year. After that, an honest training partner with a phone camera does most of the same job at zero cost.
None of this is about lifting heavier. It is about being able to lift, period, when you are fifty-five and your son wants to train with you. The lifters I see in their sixties who still squat a real load with no joint pain are the ones who fixed these five errors when they were thirty. The lifters I see who blew out a knee at forty-two and never came back are the ones who said the form would catch up later. Form does not catch up. Form gets baked in. Pick a session this week, film yourself from the side, and check all five. The squat that fixes itself by accident does not exist.
