The Only Underwater Pogo Stick Photo: hammacher.com

The Underwater Pogo Stick is the only pogo stick designed specifically for pool use -- the rigid ball is filled with water, so it allows you to bounce on the walls and bottom of your pool. Your body weight is all you need to bring it down, and the ball provides enough bounce to get you bounding through even deep water!

The handles are rubber, and the footrest is also nonstick, so you should be able to work hard without losing your grip. And while I love swimming laps, I have to say that this looks like a heck of a lot of fun. It's the type of tool that would help you burn calories without feeling like you're actually working. And the price is right -- just $59.95 at Hammacher Schlemmer.

The only caveat -- chances are you won't be able to use this at your gym's pool. But you can probably find some pool-owning pals who'll let you splash around. You know, as long as you let them have a turn, too!