Reminds me of something I might have done when I was a youth. But now, oh heck no.
When we were kids my Dad used to take my brother and I to watch his buddy race a small plywood outboard hydroplane. Not sure of the engine, other than it was small and sounded like a model airplane. Anyway, after the hydroplanes, they would race these small two man runabouts. The second guy would move his weight around in an attempt to trim the boat, very similar to what this video shows. Only what we watched was an oval course on a small lake in Lodi. Nothing like what these guys are doing. Crazy stuff.