Originally Posted by Jason David
you may also have an 'immature' squat. If you can't keep your chest up in an air squat you won't be able to do an overhead squat.
I agree. Any dificiency in your air squat will be magnified in more technical, difficult lifts. So if your having to cantilever forward to maintain balance during your basic air squat to keep your heels on the ground might cause this problem with your overhead squat.