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Why do my knees cave in when I squat, and how do I fix it?
Knees caving in when you squat? A Malta coach explains the knees-out cue, banded glute and single-leg drills that fix valgus, and when to see a trainer.
In Malta gyms this is one of the most common squat faults we fix. Your knees cave in (knee valgus) mostly because your glutes aren't switched on and the load or depth is ahead of your control. Cue 'knees out, spread the floor', lighten the bar, and strengthen with banded glute work and single-leg training.
The cue that fixes it in the moment
Knees caving in when you squat is one of the most common faults we see, and the good news is it is usually quick to clean up.
Put a light resistance band just above your knees, or simply picture one there. As you lower, and especially as you drive back up, push your knees out so they track over your second and third toes, and screw your feet into the floor as if you were spreading a towel apart underneath them. That outward effort wakes up your glutes and stops the inward collapse. For most people this single cue cleans up the squat straight away on lighter sets, before you touch a single accessory exercise. Try it on your next warm-up set and you will usually feel the difference in one or two reps.
The two fixes that make it stick
The in-the-moment cue buys you a better rep today. To keep your knees tracking once the bar gets heavier, you need to build real strength in two places.
- Strengthen the gluteus medius, the knee’s bodyguard. This is the muscle that holds your knee out over your foot. Banded lateral walks, banded glute bridges and clamshells, done two to three times a week, give you the strength to stop the cave under load.
- Train one leg at a time. Split squats, step-ups and lunges expose the weaker side, and almost everyone has one. Close that gap and it carries straight over to a stable, knees-out back squat.
Drills you can start today
- Banded lateral walks — 3 x 12 steps each way. Stay low and keep tension on the band the whole time.
- Goblet squat with a band above the knees — 3 x 8. Push out against the band on every single rep.
- Tempo squats — three seconds down, a one-second pause, then a controlled stand. Slowing it down builds the control you are missing.
- Bulgarian split squats — 3 x 8 each leg. Tough, but the fastest fix for a one-sided cave.
- Clamshells — 2 x 15 each side as a warm-up to wake the glutes before you squat.
Why it happens in the first place
Knee cave is rarely one single thing. The usual causes we see with new clients at Tal-Qroqq:
- Weak or sleepy glutes — the most common one, especially after years sitting at a desk.
- Going too heavy too soon — under load, the body collapses toward its weakest link.
- Squatting deeper than you can control — the cave often shows up right at the bottom of the rep.
- Stance and foot position — feet too narrow or pointing dead straight make knees-out harder; a slight toe-out of roughly 15 to 30 degrees gives most people room to track well.
- Stiff ankles — if your ankles do not bend well, the knees drift in to find depth, so a few weeks of ankle mobility often helps.
Is knee cave actually dangerous?
Two things often get muddled here, so let’s separate them. First, the old line that your knees should never pass your toes is a myth — your knees are built to travel, and a controlled squat is one of the best things you can do for them. Second, and separately: a repeated, uncontrolled inward collapse on your normal working sets is not something to wave off. A small wobble on a true one-rep max is rarely a problem; a knee that caves on every set, week after week, is the pattern we actively coach out before it starts to load the joint badly.
When to get a coach to watch you
Book a coaching session if the cave only happens on one side and will not budge, or if you have drilled the moves above for a few weeks with no change — a trainer can watch you move, tell whether it is a strength, mobility or technique issue, and load you safely from there. Sharp or lingering pain inside the knee joint is different from training effort, though: get that checked by a doctor or physiotherapist before you keep loading it. Through the Maltese summer heat, keep your warm-ups thorough and your hydration up too, because fatigue makes form fall apart faster than almost anything else.
