A tip based on golf schools over the last year, proper turn in the backswing. The Peak Performance Golf Swing is a "limited turn" golf swing; that does not mean no turn at all!
We have been finding students with not enough turn in their backswing and want to stress that the PPGS is a limited turn swing. You have to have a small amount of turn. The best way to measure the amount of turn you need is to use your toe line and feet position at address as reference points.
Never forget the Sacred Burial Ground! You can stand in it, but if you swing in it, you are dead. So watch the amount of turn you have in your backswing.