Here's some clever (if initially long-winded) CGI video of Darth Vader doing a 42-movement Tai Chi sword form, created by John Leo. It works very well, presumably because the lightsaber choreography has some nexus with actual swordplay, as do Tai Chi's stylized sword forms.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.