To put on the brakes after a mid-swing distraction you need to have begun with a smooth takeaway. This initial action defines the rest of the swing, so if it is smooth, the rest of the swing should be too. Think slow and low. The Knock Away, which used to be one of Nick Faldo's favorite drills, is a great way to develop a proper takeaway. Use any club—here I've grabbed a six-iron—and don't forget to turn off your cell phone before getting started.
1. Put one ball in the normal address position and a second ball two feet behind it, slightly inside the target line.
2. On the takeaway, hit the top of the second ball, knocking it backward. Maintaining your smooth, rhythmic tempo, complete the backswing and strike the first ball.