The cue “knees over toes” in a squat actually means 'don't let the knees collapse inwards or outwards and keep them inline with the feet'. The goal is to keep your knees aligned over your toes so that the knees move in the same direction as the ankle joint.
THE CUE “KNEES OVER TOES” IN A SQUAT ACTUALLY MEANS ‘DON’T LET THE KNEES COLLAPSE INWARDS OR OUTWARDS AND KEEP THEM INLINE WITH THE FEET
by Erichen February 7, 2022