Joe Rogan is a black belt in taekwondo and BJJ brown belt, and he's still in pretty damn good shape.
He has another video teaching it, check it out:
http://www.youtube.com/watch?v=Zs4uQ6DfKV8
In the end he shows kung lee's version of the kick as well.
damn that's an even better video, the floor isn't slippery, so you get to see the full power in the 'cung le' style spin kick.. that's a ton of power.
rogan is impressive.