Your knee is a hinge joint. It has a little rotary motion when bent, but really no sideways motion. What seems like sideways motion comes from the ankles or hips. The knee moves in one direction, bends and straightens. Keep your knee tracking over your foot. If you do squats and let your knees collapse inward, you are putting pressure on the side of the knee, and that can lead to problems in time. Even seemingly gentle exercise like yoga or tai chi can cause you trouble if you let the knee collapse in or turn outward. Keep it in line with your foot where it belongs.
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