Hang 5 Fitness, Chicago

You don't see a lot of out-of-shape surfers. That's because surfing exercises just about every muscle in the body. Just getting up on a surfboard works out most of the core muscles required for balance. That's the inspiration behind the classes at Hang 5 Fitness, which use indoor Surfset Fitness Riptensity boards to mimic the movement of a surfboard and provide an intense workout that doesn't require a bathing suit or sunscreen.