IMO, David brings a different line of thought to each of his clinics..You will always leave with a new trick or two..
Just love his style..
http://www.youtube.com/watch?feature=player_detailpage&v=DnWqjExc-7Y
And in action..
http://www.youtube.com/watch?feature=player_detailpage&v=QpRJOwmpsPs
Cheers