I wanted to amplify the above post in three main ways.
First, a "release" also speeds up the action thru the impact zone, so a possible use or benefit is to "get the impact over while the getting is good." That means the golfer senses that he has returned the putter head to square just before contact with the ball and wants to hurry up the impact phase while the putter is still square. In my experience, this only works out well so long as the "release" happens when the sole of the putter is traveling flat to the surface, and this flatness in the putter head trajectory serves to cue the brian when to release and how to release. Again, a well-timed stroke gets the golfer locked in to the predictability and sameness of this timing.
Second, a "controlled" stroke in which the golfer does not trust the ability to move casually more in tune with fundamental timing processes can be understood on different levels as expressive of fear, ignorance, and laziness. A "controlling" golfer is one who needs muscle tension and feel changes and conscious trying to problem-solve distance and stroke issues every putt, as opposed to a golfer who trusts his instincts and technique, takes a look at the putt, and then gets on with the business of sinking the putt by pulling the trigger with the same-every-time stroke. There just isn't any felt need of a great putter to worry or fret about distance control or technique, and golfers who take practice strokes beside the ball and worry about whether their "release" has the proper dynamics are almost always expressing their lack of casualness about the putt. That's a fear-based approach to putting, as opposed to a proud, winner's approach. At the next level, "controlling" the putt with hands and arms is ignorant of a better way, which is to commit control to management of the forces of the swinging putter, arms and hands to the pivot stability and the biomechanical advantages of parallel-left shoulder frame alignment in an otherwise propitious setup (mostly a balanced stance at the right distance back from the ball). And the laziness level is that the golfer simply accepts and tolerates this approach to putting as a matter of habit, without serious effort to improve.
Third, my statement above ("Note also that it is NOT POSSIBLE to have a "release" without deceleration of the hands and arms below the velocity of the clubhead.") could be misunderstood and also prompts some further observations. While it IS possible to voluntarily move the hands via wrist-joint activation in the putting stroke thru impact, a motion I would describe as a "swiping" action that speeds the hands ahead of the momentum-sponsored velocity of the putter head, I don't believe this is what golf teachers intend to mean by the term "release." The term "release" implies a passivity in the human body in relation to the moving tool (club or putter).
So there is a point of discrimination here that may prove valuable, even to golfer who WANT to learn a "release" as taught by others. The golfer should notice the difference among:
1. slowing the arms in the impact zone and allowing the putter head's momentum to carry on by leaving the muscle tone in the wrists at a level of tension that allows the wrist change called a "release";
2. slowing the arms as above but also managing the wrist tension in a fashion that only partially allows the putter head momentum to carry on, but instead somewhat restrains and limits the momentum in a "cupping" that prevents further "release" (Leadbetter); and
3. deliberately speeding the hands thru impact with wrist changes to "swipe" the putter head faster thru impact than it otherwise would go based on its own momentum.
Tiger's drill where he plants his left hand against his right upper arm just above the elbow and makes strokes thusly to feel the "release" that happens when his forward-swinging right arm meets the stopping point of his left hand against the right upper arm, generates a "release" that COMBINES a little wrist action with some "elbow" release as well. Is that what he wants and is that what he does when he makes real strokes? Perhaps.
By making these discriminations that focus upon different patterns of body motion, we can teach and learn and make choices on a better and more permanent basis.
Cheers!
Geoff Mangum
Putting Coach and Theorist
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