Shorten the left thumb to shorten your backswing
Left-thumb length on the grip regulates backswing length: to shorten your backswing, use a shorter left thumb; if you struggle to get any wrist hinge, try a slightly longer thumb. The shorter left thumb gives more control and a more stable top of the backswing.
Channel: Dan Grieve
Watch official source at 18:33Why this context matters
Aimed at players with an overswing or, conversely, too little wrist hinge.