How to Perform Squats Correctly: Technique, Muscles, and Common Mistakes

The squat is the most important basic exercise in strength training because it loads the thighs, glutes, and core simultaneously, activating more muscle mass than almost any other movement. What matters isn't how much weight you lift, but how cleanly you execute the movement – when learned correctly, the deep squat is not a risk but a joint-protective training measure, according to sports science literature.

In this guide, you'll get the complete technique step-by-step, a clear answer to the depth question, a comparison of the most important variations, and the seven mistakes almost everyone makes at the beginning. All in the order you need it.

Which Muscles Does the Squat Work?

The squat is a multi-joint exercise – hips, knees, and ankles work together. The main player is the quadriceps (front of the thigh), which is responsible for knee extension. The gluteus maximus stabilizes the hips and provides the drive from the deep position. The posterior chain and core keep you upright and stable.

Muscle Group	Role in the Squat	Stronger with…
Quadriceps	Knee extension, primary upward drive	upright torso, high-bar & front squat
Gluteus maximus	Hip extension, drive from the bottom	greater depth, low-bar squat
Adductors	Thigh stabilization, hip extension	wider stance, deep bend
Hamstrings & Erector Spinae	Stabilization, neutral spine	Low-bar, heavier loads
Core	Keeps torso upright, protects spine	Front squat, heavy weights

How to Perform the Squat Correctly: Step-by-Step Technique

1. Setup & Stance

Set the barbell in the rack at about shoulder height. The bar rests on your upper back (trapezius), not your neck. Grip slightly wider than shoulder-width, tense your upper back, and lift the barbell out of the rack with straight legs. Take only one or two steps back. Your stance should be about shoulder-width, with toes pointed slightly outward (15–30°).

2. The Downward Movement

Inhale, brace your core, and push your hips and knees back and down simultaneously – as if you're sitting on a low chair. Your knees should follow the direction of your toes and can extend past them. Keep the weight over the middle of your foot, your back neutral, and your chest upright.

3. Deepest Point & Upward Movement

Go as deep as you can maintain control and a neutral back – ideally until your thighs are at least parallel to the floor. Then, powerfully push up through your entire foot, driving your hips forward, and exhale in the upper third of the movement. Your knees and hips should extend simultaneously.

How Deep? The Truth About Squat Depth

The concern that deep squats are bad for the knees persists – but the data suggests otherwise. A review in the Swiss Sports & Exercise Medicine Journal concludes that if technique is learned cleanly under supervision and the load is progressively increased, deep squats do not pose an increased risk of injury to passive structures – on the contrary, they tend to be joint-protective.

For muscle growth, depth is beneficial: deeper squats activate the glutes more strongly and lead to greater growth in the quadriceps than half repetitions. Interestingly, a finding from EMG studies (including Schoenfeld, Escamilla) shows that beyond about 90° of knee flexion, pure quadriceps activity does not continue to increase linearly – the additional stimulus from depth primarily comes from the greater range of motion and the stronger involvement of the glutes and adductors.

Practical Conclusion: Depth is a goal, not a dogma. Mobility, bar height, and goal play a role. Better to go cleanly to parallel than deep with a rounded back.

Squat Variations Compared

Variation	Focus	Good for
High-Bar (bar high)	upright, quad-dominant	muscle building, beginners
Low-Bar (bar low)	more hips, glutes & posterior chain	maximal loads, powerlifting
Front Squat	very upright, quads & core	mobility, technique, Olympic lifting
Goblet Squat	light, beginner-friendly	introduction, warm-up, home

Breathing, Core Pressure, and Foot Pressure: The Invisible Details

Three details determine stability and safety – and they are barely visible from the outside. The first is breathing. For light sets, you inhale at the top and exhale in the upper third of the upward movement. For heavy loads, many use the Valsalva maneuver: inhale deeply into the abdomen at the top and hold your breath during the downward movement and the first half of the push-up. This intra-abdominal pressure stabilizes the spine like an internal belt.

The second detail is core tension: Actively brace your abdomen as if you expect a light blow – tense all around instead of sucking in. The third is foot pressure. Distribute your weight over three points: heel, ball of the big toe, and ball of the little toe. This "tripod" keeps you balanced over the middle of your foot and ensures that your knees remain stable over your toes instead of caving inward.

Squats for Beginners: The Right Progression

If you're new to squats, first learn the movement without weight. A proven three-stage progression: Start with bodyweight squats until you can go deep cleanly and with control. Then switch to goblet squats, where you hold a dumbbell or kettlebell in front of your chest – the counterbalance helps you stay upright and go deeper. Only then move on to the barbell in the rack.

Progress over weeks, not days. A typical start is three to four sets of eight to twelve clean repetitions. Only increase the weight when your technique remains stable throughout all repetitions. If you lack depth, incorporate a few minutes of targeted warm-up for your ankles and hips before training – this often improves mobility after just a few sessions. And always work with the safety pins of the rack: when set correctly, they catch the barbell if a repetition fails.

The 7 Most Common Squat Mistakes

These mistakes will cost you progress – and eventually, joint health:

• Caving Knees: Knees fall inward. Actively push them outward, in the direction of your toes.
• Rounded Back: The lower back rounds at the deepest point ("butt wink" due to lack of mobility or too much depth). Brace your core, adjust depth to your mobility.
• Hips Shoot Up: Hips rise faster than shoulders – the exercise becomes a "good morning." Lead with your chest, extend simultaneously.
• Standing on Toes: Heels lift off the ground. Keep weight over the midfoot, use weightlifting shoes if necessary.
• Insufficient Depth: Half repetitions with ego weight. Better to use less load but a full range of motion.
• Bar on Neck: Pressure on the cervical spine. The bar belongs on the trapezius muscle.
• Too Much, Too Soon: Load before technique. Progress gradually – technique first, weight second.

Buyer's Guide: The Right Equipment for Safe Squats

For heavy squats, you need three things: a sturdy power rack with safety pins, a good barbell, and stable footing. When choosing a rack, look for a high weight capacity, close hole spacing in the lower section (for the correct pin height), and concrete-anchored or bolted stability. Weightlifting shoes with firm soles and slightly elevated heels help with limited ankle mobility.

At Kraftathlet, you'll find professional racks, barbells, and plate-loaded machines of studio quality – as an authorized dealer with full manufacturer's warranty and, if desired, with 0% Klarna financing. Browse our strength training collection or our plate-loaded machines. If you want to deepen your technique, also read our guide on Deadlifts: Technique, Muscles, and Mistakes and how to get stronger systematically with Progressive Overload.

Frequently Asked Questions About Squats

Are deep squats bad for the knees?

No. With clean technique and progressively increased load, deep squats are considered safe and even joint-protective. Pain almost always arises from technique errors or too rapid load increases, not from depth itself.

Can the knees go past the toes?

Yes. The knees can and often must travel past the toes, especially in upright variations like front or high-bar squats. The key is that the knees follow the direction of the toes and do not cave inward.

How often should I train squats?

For most people, one to two squat sessions per week with sufficient rest in between are enough. More important than frequency is the continuous increase in repetitions or weight over the weeks.

What is a good weight benchmark?

This is very individual. Initially, don't focus on a number, but on clean repetitions through the full range of motion. A solid guide for experienced lifters is squatting their own body weight on the bar – but technique always comes first.

Do I need a weightlifting belt?

Not for light to moderate loads. A belt can support core pressure during heavy sets, but it never replaces active core tension. First, learn to stay stable without a belt.

Conclusion

The squat rewards patience: clean technique, full range of motion, and gradual load progression will bring you more muscle, more strength, and healthy joints. Go as deep as you can maintain control, avoid typical mistakes – and progress week by week. Do you want the right rack or a recommendation for your gym or home gym? Talk to our team – we'll advise you personally.