Why your knees hurt when you squat deep

Deep squats aren't inherently bad for knees

This is the first thing to get out of the way. There's a old myth that knees past your toes or squatting below parallel is dangerous. It's not true for most people. Deep squatting is a normal human position, the kind toddlers do to pick up a toy without thinking twice.

So if your knees hurt going deep, it's not proof that deep squats are the problem. It's more likely that your knees aren't used to that range yet, or something around the joint is cranky and needs attention before you load it hard.

The usual suspects

A few things show up again and again when dads mention knee pain on deep squats. None of these are a diagnosis, just the common patterns I hear about and have dealt with myself.

• Weak or undertrained quads, especially the muscle just above the inner knee, so the kneecap doesn't track smoothly
• Tight hips or ankles that force your knees to do extra work to compensate for the range you're missing elsewhere
• Going from zero squatting to deep squatting too fast, like jumping into a new program without easing in
• Old wear and tear, like a past injury, that flares up under load
• Simply squatting rarely, so the joint isn't conditioned for that position under any load at all

What actually helps

Start by checking your ankle mobility. Kneel down and try to push your knee over your toes with your heel flat on the ground. If it's stiff, your knees end up compensating every time you squat deep. A few minutes of ankle work before you train can make a real difference.

Build up the muscles around the knee joint without going straight to max depth. Wall sits and slow step-downs let you strengthen the area under control, and terminal knee extension work targets that inner quad muscle that often lags behind.

Also just squat more often, at a depth that doesn't bother you, and let the range creep down over weeks. A supported deep squat hold, where you hang onto something for balance, is a low-stress way to spend time in that bottom position without full loading.

• Wall-Sit Isometric to build tolerance without a lot of movement
• Slow Step-Down to strengthen the knee through a controlled range
• Terminal Knee Extension (band) for the inner quad
• Supported Deep Squat Hold to get comfortable at depth again

How to squat while you sort this out

You don't have to stop squatting while you work on this. Just back off the depth that hurts and train in a range that feels fine, then slowly push it deeper over a few weeks as things settle.

Goblet squats are a good option here because holding the weight in front naturally keeps your torso upright and takes some pressure off the front of the knee. Bodyweight squats are fine too if you're easing back in after a break.

If your knee pain shows up on other moves too, like lunges or stairs, it's worth looking at the bigger picture rather than just the squat itself.

When to actually get it checked

Mild ache that fades once you warm up is usually not a big deal. What's worth paying attention to is pain that's sharp, that lingers well after you train, that swells up, or that radiates down your shin or up your thigh. That's a different situation and a physio or doctor can tell you what's actually going on instead of guessing off the internet.

If it's more of a nagging tightness or general knee crankiness, the Knee Pain hub has a full set of moves worth working through.

Common questions

More from the blog