Also drive through your heels, not the balls off your feet. For regular squats, lower your self so your upper legs are parallel to the floor. For deep squats, go lower. Stick to regular squats in the main as deep squats are a bit harder on your knees.
If you don't use weight, try doing more squats or do them slower. Also try isometric squats, ie holding the squat potition for 60 seconds or so in between squat sets ,and one legged squats.
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