One of my hobbies a few years ago was underwater ballet. Most people think it's a sham, but I simply adored it. No, it's not as hard to stand on your toes in still water; but when the current gets going for some of the more daring or action-y scenes it can get very hard to swim against. Not to mention pirouette . Often times the biggest danger is drowning. If you cant make it to the next hidden scuba tank, you could die in seconds. You have to have great lungs, good body strength, the ability to withstand the churning and tossing of water while remaining graceful and in character, and (not that I would ever admit it); be able to do all of it (sometimes) while latex/spandex/shiny material squeezes your legs together in an almost-blood-cutting-off hold. It was fun, deadly and dangerous, but fun and fulfilling.