I believe that "flow" comes with experience, and confidence. As you correctly said when riders first start out they seem very rigid, this is because they learn the move first, then after attempt to make it smoother and more flowing. I myself find that when i first learn a move on an object, be it a wall or whatever i concentrate on getting the move right so much so that i don't think about making it look good, i attempt to nail the move over and over again and i find i gradually become smoother as i repeat it. I think the key as always unless you are generally a very confident person with a lot of guts is too just practice, i know everyone says it but it really is the key. Dan p.s why isn't this lad validated?!