Issue: March 1968
Instructor: "Lighthorse" Harry Cooper
Demonstrated by Top 100 Teacher Mike Perpich
During your backswing, turn your hips laterally (or to put it a different way, parallel to your target line like you're doing "The Twist"). On the way back down, forget this notion of lateral and turn your hips on a diagonal to your target line. A good way to think about this move is to turn your right hip back toward the target at the start of your downswing, instead of pulling your left hip directly behind you.
Why It Works
Turning your hips diagonally on your downswing rather than turning them like you're standing in a barrel creates separation between your upper and lower body, giving you that whip-crack action you see at impact in a powerful swing. A lateral downswing hip turn limits the speed of your swing to what you can create with your arms, and invites a tendency to cut across the ball and hit a pull or slice.
The Top 100 Says"Cooper's tip was ahead of its time. Instructors wouldn't talk about creating torque by pitting one part of the body against the other for another 20 years. Turning your hips diagonally on the way back down allows you to keep your clubhead online longer and generate extra speed. Forget Percy Boomer's "swing-in-a-barrel" theory that's an image that can cause spinouts. Go with Cooper's and watch the yards pile up." Dr. T.J. Tomasi