The snap the kinetic chain folks want you to increase the down swing pivot speed and put the brakes on just before impact. Now that is ridicules and does not add club head speed.
Let the folks moor themselves in the sea of their own Bowel Movements.
Muscles stretch and shorten. When we have Pivot Lag, we've created a stretch. When the muscles shorten or contract, they pull between each point of contact. Neither point remains a fixed point in three dimensional space. Therefore, when the muscle contracts it's pull is through the length of the muscle, and it pulls in both directions.
So, here's an over-simplification:
Point A accelerates, point B drags and the muscle stretches.
When the muscle contracts between A and B, it decelerates A and accelerates B, even though they both have forward momentum.
Point A has no choice but to slow down.
A fool would try to stop the hammer just before it hit the nail.
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