Perhaps two of the sweetest swings in all of golf - Mickey Wright (who gets my vote as the best swing of all time!) and a young Ernie Els.
Both these golfers are at or approaching the top of the backswing. Notice how their right side is flush up against the 84 degree line.
These illustrations are just two of the 45 that you will see in "It's All About Impact". They will all sell you on the idea that preparing the body to get to impact is what the focus of the swing should be. After all, there are many ways to swing the club, but only one way to hit the ball!