Why does Matt Kuchar rock back on his heels just before swinging?

      — Steve, Oceanside

This is how he triggers the golf swing. A trigger is an automatic cue, to begin the motion, without any thought or tension. Some forward press their hands. Some kick the right knee in. Kuchar moves away from the ball, putting his weight into the heels.

Golf is a tough game because there is nothing to react to — like a pass or serve or catch in other sports. We initiate motion from a stand still, which is why I believe it is the toughest sport mentally. But all good players have some sort of a trigger.