[LitFan]

If you squat with proper form, there is almost no pressure on your knees, because you're not pressing against them.

Heels flat on the floor, knees in line with your toes, but behind them. If you don't have the hip mobility you need to get your knees behind your toes, you'll feel a strain on your knee.

You should be able to lift your toes off the floor as you stand up - all the weight is on your heels.