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With a Putter or Chipping Club, swing the Clubhead radically Inside-Out across the Target Line while keeping the Clubface Square to the Target. The Ball will go straight toward the Target.

The object of the exercise is to teach the player that the Ball goes where the Clubface is "looking" and not in the direction of the Clubhead Path. Thus, it reduces the inclination to Steer the Clubhead down the Target Line.

Thanks Yoda, the description in the book regarding the closed-closed stance (from memory) confused me a bit but your explanation is clear and i've been doing it correctly!

Cheers