Squat form explained: depth, knees and how to fit squats around recovery

Step by step: the basic movement

The movement begins by sending the hips back and bending the knees and hips together, which lowers the torso, and it ends by returning to a standing position. A practical way to think about it is "sit back and down, then drive up through the whole foot". Keep your chest from collapsing forward, keep your weight spread across the foot, and let your knees travel in the same direction as your toes.

Control matters as much as position. Going down too fast is one of the common errors, because it can make you lose the tightness you built by bracing your trunk. A steady descent and a deliberate turnaround at the bottom are worth more than a fast bounce, especially when you are learning.

The four mistakes worth watching for

Four errors come up again and again. The first is the rushed descent described above. The second is leaning the torso too far forward, which increases the load on the lower back and raises the risk of a disc injury. The third is the knees caving inward, often called valgus. The fourth is the heels lifting off the floor, which reduces how much the glutes contribute.

Poor form in strength training generally can lead to strains and even fractures, and it also stops the target muscle from being challenged properly. In other words, a sloppy squat is both riskier and less useful. Filming yourself from the side once in a while is a cheap way to see which of the four mistakes you tend to make.

How deep should you go?

In powerlifting competition, a squat counts when the crease of the hip drops below the top of the knee, a position called "parallel". Squats below that line are called full or deep squats, and those above it are called shallow. The knee question is genuinely mixed: forces on the cruciate ligaments drop at deep knee angles, while compressive forces on the menisci and cartilage peak there, so the relative safety of deep versus shallow squats is hard to settle.

One review from 2013 concluded that deep squats performed with proper technique do not increase the rate of degenerative knee injuries, and suggested that shallower squats might contribute to long-term wear in the lower back and knees. At the same time, deeper squats increase the compressive load behind the kneecap, and people with pain around the kneecap may not tolerate them. The sensible reading is that depth should be earned with control. If deep squats hurt, that is a reason to see a professional, not to grind through.

Variations, from bodyweight to barbell

The air squat is the plain bodyweight version, often done for many repetitions. The goblet squat holds a weight at the chest, the split squat puts one foot behind you on the floor, and the Bulgarian split squat raises that rear foot on a platform. With a barbell, the back squat carries the bar on the upper back and the front squat holds it in front, which also works the upper back more.

Single-leg squats are described as useful for building the stabilising muscles, improving balance and addressing imbalances between the legs. The pistol squat is the demanding end of that family: a full-depth squat on one leg with the other leg held straight out in front. The jump squat turns the movement into a plyometric, explosive exercise. Which version you pick on a given day can be a recovery decision as much as a strength decision.

Breathing and bracing under load

A common pattern is to breathe in while lowering and breathe out while lifting, although the reverse is also recommended and heart rate and blood pressure differ little between the two. Powerlifters with very heavy loads often hold their breath and brace, known as the Valsalva manoeuvre, which raises pressure inside the chest and abdomen and supports the torso.

That technique has a cost. It raises blood pressure and restricts breathing, so it can be dangerous for people with hypertension or for anyone who faints easily. If either applies to you, keep the loads moderate, keep breathing, and talk to a doctor before heavy lifting.

Sore legs after squats

Squats are a classic cause of delayed onset muscle soreness, the pain and stiffness that appears after unaccustomed or strenuous exercise. It usually builds over the first day, peaks between one and three days later, and fades within a week. The lowering phase is the main culprit, because lengthening contractions cause soreness while shortening contractions cause none.

The good news is that the body adapts. After a bout of severe soreness, the same muscles become less susceptible to damage from the same exercise, an effect that lasts several weeks. Increasing the intensity of a new programme gradually also reduces soreness. Static stretching before or after exercise does not reduce muscle soreness in healthy adults, so do not count on it.

Fitting squats into your recovery

Recovery within and between sessions is fundamental in strength training; without it, fatigue can reduce performance and raise injury risk. Between hard sets, resting three to five minutes allows significantly more repetitions in the next set than resting one or two minutes. Low variety combined with high volume is described as a likely route to overtraining.

Your watch cannot see your knees, but it can give context. A higher resting heart rate, a lower HRV or a short night can line up with legs that still feel heavy from the last session. On those days the choice is not only "squat or skip". You can swap heavy barbell work for bodyweight squats, use a shallower range you control well, or keep the session short. A second hard lowering-focused session within a week of severe soreness has been linked to reduced muscle function right afterwards, which is another reason to keep things lighter while you are still sore.

Key takeaways

Question	Short answer
Where does the squat start?	Hips back, then bend hips and knees together
Which mistakes matter most?	Rushing down, leaning forward, knees caving, heels lifting
Is going deep bad for knees?	Not with good technique, but knee pain is a signal to get checked
What if legs are still sore?	Go lighter or switch to bodyweight until it settles

The squat rewards patience. Learn the hip-back pattern, own the depth you can control, and let your recovery data decide whether today is a heavy day or a light one. That way the exercise keeps building you up instead of wearing you down.

This article is general health information and is not a substitute for medical diagnosis or treatment. Consult a healthcare professional if you have concerns.