There are some players who focus in on maybe their left knee initiating the downswing. Nick Faldo used to do that. Some players try to get into this famous 'sit down' position.
Jim Flick
Ben Crenshaw told me Mr. Penick asked him to start his downswing with his left knee bowing and going to the target. I really like that. I think the more we use our hips and our shoulders the more trouble we're in.
