I curled a few years in high school and everyone also argued how it wasnt a sport. If you have every watched it to see how hard they are breathing after they sweep, you would realize that its not like sweeping your kitchen floor. And you have to remember Furby doesnt sweep.. so he can have a belly :P
Yeah, I've curled a few times, and sweeping is a good workout.. but it's no where near any other olympic sport I can think of.