Why the squat is the king of exercises

The squat gets called the king of exercises so often that it starts to sound like a slogan. It isn't — one movement loads the largest muscles you own, plus your spine, hips and cardiovascular system. Here is what you actually get out of it, how much to do, and where people usually get it wrong.

What actually happens when you squat

The squat is not a leg exercise. It is a whole-body exercise that happens to bend the knees. In a single rep you are working:

• Quadriceps and gluteus maximus — the two biggest muscle groups in the body; a trained person's glute max alone comfortably passes 800 grams per side.
• Adductors, the inner thigh — they take a surprisingly large share of the work in the bottom third of the movement.
• Hamstrings and spinal erectors — they keep your torso from folding forward.
• Core and diaphragm — the pressure you build in your abdomen during a heavy set is what actually stabilises your lower back.

That is also why it is metabolically expensive. A set of 5 reps at 80 percent of your max pushes your heart rate to 150–170 and keeps it there for a minute and a half. A set of 20 with a lighter bar does roughly what a sprint does. No biceps curl comes close.

The part that usually gets left out: bone responds to load. Vertical loading through the spine and hips is one of the few known ways an adult can maintain or slightly improve bone density at the hip and lower spine. The dose being discussed is 2–3 sessions a week over 6 to 12 months, not a couple of good weeks.

Carryover to real life

Getting off a chair, picking a child up off the floor, climbing stairs, getting out of a car — all squats, just with different loads. There is a simple field test for this: how many times in 30 seconds you can stand up from an ordinary chair without using your hands. Under 12 reps for someone aged 60–65 is considered below average and tracks with fall risk. If you are squatting 60 kg today, that test will not be a topic for you in thirty years.

You don't train the squat so you can squat. You train it so that getting off the floor at 70 is still a boring, unremarkable thing to do.

Which variation to run

Goblet squat

Weight held at the chest, 8–15 reps. The best entry point for anyone who has never squatted — holding the load in front automatically fixes your torso position. A realistic starting weight for most adults is 12–20 kg.

Back squat

The standard for strength and muscle. A higher bar position gives a more upright torso and more quad work; a lower bar shifts work to the hips and usually allows more weight.

Front squat

Bar on the front delts. It punishes any forward lean, which makes it an honest technique check. Expect to handle 70–80 percent of your back squat.

Bulgarian split squat

Rear foot on a bench, 3 sets of 8–12 per leg. Fixes left-right differences and spares the spine — a good pick on days when your back is not up for a loaded bar.

Technique in six points

1. Feet slightly wider than your hips, toes turned out 15–30 degrees.
2. Breathe into your stomach, not your chest, then brace as if you were about to take a punch.
3. Start hips and knees together; knees travel over the toes, never collapse inward.
4. Go at least to parallel — front of the thigh level with the floor. Deeper only if your pelvis doesn't tuck under at the bottom.
5. For the first 8–12 weeks, no bouncing: 2–3 seconds down, brief pause, then up.
6. Finish tall, without an exaggerated hip thrust at the top.

How many sets, how often

In practice, legs get 10–20 hard sets per week, spread over 2–3 sessions. Concretely:

• Beginner: 3 sets of 8 with a weight you could lift 11–12 times. Add 2.5 kg a week for as long as it keeps working, usually 8 to 12 weeks.
• Muscle: 3–4 sets of 6–12, 2–3 minutes rest, stopping each set 1–2 reps short of failure.
• Strength: 4–5 sets of 3–5 at 80–87 percent of max, 3–5 minutes rest.

Leave at least 48 hours between two heavy leg sessions. Muscle soreness 24–72 hours later is normal; sharp joint pain is not.

The mistakes that cost the most

• Heels lifting. Test your ankle: kneel into a lunge and try to touch your knee to the wall with your big toe 10–12 cm away from it. If you can't, work on it and use a slightly raised heel in the meantime.
• Knees caving in under load — usually weak hip control. Drop the weight by 20 percent and spend 2–3 weeks doing clean reps.
• Adding weight too fast. More than about 5 percent load increase per week is a reliable way to inflame a tendon.
• Half reps with a big number on the bar build less muscle than a full range of motion with 20 percent less weight.

What to eat around it

Without enough food, squatting is just fatigue. Practical ranges: 1.6–2.2 g of protein per kilogram of bodyweight per day — for an 80 kg person that is 130–175 grams, split across 3–4 meals. Carbohydrates 4–6 g/kg on heavy training days. Sleep 7–9 hours; below 6 hours both strength and your tolerance for volume drop. Water 30–35 ml per kilogram daily, more in summer.

When to see a doctor

Call a doctor, not a coach, if:

• knee or hip pain lasts longer than two weeks, or shows up at rest and at night;
• pain radiates down the leg, with numbness, tingling or foot weakness;
• the knee swells, locks, or gives way under you;
• you get chest pain, dizziness, shortness of breath or fainting while straining;
• you have uncontrolled blood pressure, a hernia, recent surgery, or you are pregnant — run the plan past a doctor before your first heavy set.

The short version

• One squat rep works quads, glutes, adductors, hamstrings and core, and loads bone and heart on top of that.
• Start with goblet squats at 12–20 kg and move to a bar only once the technique holds.
• 2–3 sessions a week, 10–20 hard sets total; beginners run 3×8 and add 2.5 kg weekly.
• Depth to at least parallel, knees tracking over the toes, 48 hours between heavy sessions.
• 1.6–2.2 g of protein per kilogram and 7–9 hours of sleep, or the training has nothing to work with.