Not this 
What you should do instead
Turn with your chest
As you take away the club, focus on turning your chest away from the target—your arms, hands and club are just along for the ride. This creates the controlled coil you need for big drives.
Keep your left arm firm
Overswinging and power loss occur when you collapse your elbows on the way to the top, which drops your hands toward your head. Instead, maintain a firm left arm and try to keep your hands as far away from your head as possible to create maximum width.
The Drill to Make it Happen
How to make your backswing more compact and create more coil
The story is for you if...
* Your driving is inconsistent
* Your distance doesn't match your swing speed
* You make contact on the toe or heel more than in the center
The Problem
In an attempt to create more power you swing for the fences and bring your club way past parallel at the top.
Conventional wisdom and why it's wrong
Everyone tells you to make a three-quarter swing. Problem is, when you shorten a bad swing, you get a short bad swing.
1. Your backswing can only be as big as your flexibility allows, but that shouldn't stop you from creating maximum width. Start your swing by keeping both arms straight until the shaft is parallel to the ground (hands at waist height).
2. Stop your swing and cock your wrists (keeping your left wrist flat) until the butt of the shaft points just inside your target line.
3. Without lifting your arms or bending your left elbow, turn your chest away from the target and fold your right elbow 90 degrees. Check that your hands are far away from your head. Now you're coiled and in control.
