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09/24/2013 at 7:41 pm #72846
Looks like you are definitely overextended when you un-rack the bar. You also look to be extending even more when you first initiate your squat. Focus on sitting straight down and driving knees out. These are positioning faults that you can clean up with some practice.
If you are still squatting like this when you have Oly shoes on you should start at the hips. Check out these two videos below. You probably are missing a lot of hip flexion and hip external rotation. Start there and continue to work on your squat technique with little to no weight. If you can’t do a relatively clean body weight squat, you should stay away from back squatting until you have cleaned up your movement.