Anyone familiar with those sports knows that when you are smooth and use your momentum you are much faster and the whole goal is to use every hill and dip to gain you even more momentum. When you watch guys race it is obvious who understands it and who doesn't. I used to ride and race with a guy named Brian Lopes who is a former DH, BMX and dual slalom champion. He was a good friend of mine, and he was/is great at this technique

This is an amazing example of just that. Also glad to see some Americans doing well, as the euros have dominated the sport almost since the late 90s.