Light as a feather
(By the way--raise your hand if you used to play "light as a feather, stiff as a board" at sleepovers. That game was the shit.)
So anyway: I've lost 10 lbs since I started karate. I'm now within 5 lbs of where I was when I started my crazy pills and within 10 of where I really want to be. Part of it is the karate itself, of course--but more than that, karate makes me want to BE stronger, healthier and more fit, so I've been walking more and even doing some light (very light) arm weights. Plus, did I mention that our classes are conducted in front of a wall-length mirror (kind of like ballet)--which can be pretty damn depressing if you're not happy with how you look but are forced to stare at yourself for an hour 2-3 times a week. It can be quite the motivator, let me tell you.