I never was specially interested in deepening the technique of putting know-how but never was a bad putter either as well as my students do not need putting lessons (at least from me). Recently I have read that great putters hit the ball on upswing which means they increase the loft of the putter. Granted, it makes a total sense in avoiding skidding and searching for a true rolling from the start. However, greens are tightest possible surfaces in golf what would mean the low point has to be just a bit over the grass and still well before the ball. I would appreciate comments from teaching putting pros and really good amateur putters on the matter.