Picture a quarterback throwing downfield: The longer the pass, the farther back he pulls his arm before throwing. The same is true in golf: To hit it long, you must stretch your arms away from the target in the backswing, creating a wide arc.
Build a Pyramid
With your driver, set up so the insides of your heels are under the outsides of your shoulders, forming a pyramid from head to toe. Play the ball opposite your front heel and tilt your spine to the right so the club leans slightly away from the target.
This wide setup gives you the stability you'll need to reach back without losing your balance. It also helps you engage the large muscles of your arms and chest to push the club away. The forward ball position delays the club's release, keeping your wrists hinged until just before impact.Drill: Reach Back