One of the putting drills that Tiger uses is a gate drill to putt with just his right hand. He uses two tee pegs in the ground that are place only slightly wider than the width of his putter. The benefits are to promote center contact and insure the putter head does not travel either outside or inside the proper path.
In this video, the DynAlign pre-shot routine is done with the trail arm only to provide stability to the right arm, and make it easier to make a proper stroke that stays on track. The right hand is in a natural tossing or rolling position, while the trail elbow is more forward to make certain that it leads the head through the stroke.
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