Hello, my name is John Webster, Master Instructor with the Jim McLean Golf School at Doral Resort and Spa. Many of the students that we see in our golf school lose power in their golf swing before they ever get to the golf ball. Two common errors we see in an improper backswing: One would be a shortening of the arms where both arms bend and the club is very close to your shoulder. The second problem we see at the top is a breakdown, curve or the cupping of the left wrist. This puts the clubface into an open position. The proper position would be with the arms extended and the left wrist flat and the arms out away from the shoulder, a much stronger position to get into before you get the club back to the ball. I think if you try this you will gain a few extra yards and probably more consistent golf shots.