The pig drover's crack is real easy to describe. Using the right arm get
the whip rotating counter clockwise (viewed from above) over your head.
Assume 12 is straight ahead. When your arm gets to 2 o'clock, stop for a
moment, and let the whip carry on, then hurry up to catch up with it.
The nice thing about this is that you can do it continuously, and the
whip never changes direction. Doing it every other circle is fairly
easy, and I am working on doing it every circle.