IN class we were told, when we practice, to mark out an imaginary square on the ground. Walk the square, turn at the corners, go kitty corner, about turn and reverse about turn. Not for long, maybe a minute or so. It helps build focus as your pup has no idea where and when his crazy owner is going to turn. Walking briskly really helped us and I softly bumped the dog out of the way and kept going when he got in front of me.