And they actually do it a lot better than me, as evidenced in this high quality amateur film documenting the 2009 / 2010 Rhode Island windsurfing season. The film, "An Ocean State of Mind" was put together by a guy named Steve Frazier. It's half an hour long, but it's good all the way through if you've got the time.
I'm glad I'm not the guy whose nose picking and subsequent wiping-it-on-his-wetsuit was forever immortalized at 7:01 in the video. If that was me I'd have been a little sore with the videographer.