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Kirk usually has to flip at the ball because his body moves too quickly in transition from backswing to downswing, causing the club head to fall behind the hands on the downswing. To sync his body and arms, he hits balls while holding the club with just his left hand. Because it is more difficult to control the club when holding it with one hand, this drill forces the player to keep the club in a more neutral position on the downswing. If the club falls behind the hands, as it does when Kirk is swinging poorly, it is difficult to hit the ball properly. The easiest way to hit the ball cleanly is for the clubhead to work on the proper plane, where it falls to the outside of the hands as it approaches the ball.