Extend your lead arm for a more powerful swing.
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Turn your driver upside down and grab it with your trail hand in your normal posture. Make a full and free takeaway, turning as far as possible without compromising your posture. It’s all right if the shaft goes well past parallel, and no doubt you’ll feel a stretch through your chest. Now, swing down. You’ll immediately feel how incredibly powerful and active your trail arm becomes to help you generate clubhead speed. (If you swing the club hard enough, the shaft will create a pleasant whoosh sound through the hitting zone. That’s real speed!)
By repeating this simple drill, you’ll train not only your trail arm, but your whole trail side to load up on the backswing and fire through on the downswing to generate added power for longer drives.