This video golf lesson features advice from PGA Professional Michael Breed that will help you improve your backswing, specifically getting your backswing on the proper plane.
Being on the correct plane means having the shaft of the club at similar or parallel angles at the halfway point in the backswing and in the initial position of the swing. Most golfers have a tendency to turn the club around, which puts the head of the club at the wrong side of the handle.
Breed demonstrates a simple drill that will correct this problem and put you on the correct plane, which will give you more consistently successful swings.