An evil wheel is one of those ab roller-like devices. It looks like a lawn mower wheel with handles attached. They are absolutely fantastic (no pun inteneded) for ab work. A Swiss ball is an oversized inflatable beach ball-like thing. You use it for a variety of ab work. I got my evil wheel at WalMarts for about $8, the swiss ball from century martial arts supply-they call it a ukemi ball- I forget how much, Sorry.