Shorten backstroke, lengthen through to stop deceleration
To cure putts that decelerate through impact, the golfer shortened his backstroke and lengthened his through stroke. He traces his deceleration to taking too big a backstroke after switching putters; the shorter-back, longer-through change is what he credits for his recent putting improvement.
Channel: gm__golf
Watch official source at 6:54Why this context matters
Said mid-round while explaining why his putting stroke feels good this round.