Originally Posted by
marcf
Your knees aren't out hard enough--your right knee seems to cave in quite a bit--and you're dive-bombing your squats and going too deep. Your toes might be point out a little too much. Control your descent, stay tighter, cut your depth to just below parallel and keep your knees out a little harder. Staying tight and controlling your depth will also help you fix that lumbar flexion you're talking about.