Oh, and one thing that tends to build speed is if you toss the treat. Let's think about the clockwise direction - you might start off by marking as soon as his head is at the post, and then toss the treat to the right, so he doesn't wrap the full 180 degrees - more like 90 degrees. As you progress, you can toss the treat more and more around the "clock face", so you are throwing it behind you to do a 180-degree wrap, and to your left, once he's done 180 degrees, to get a 270 degree wrap.