Photo: Marilou Daubé, AQUA Studio NY
Why you should try it: Aside from the novelty factor (bikes in a pool!), you'll be getting the best of both worlds. For example, you may feel you're using more of your core and arms while spinning against water resistance; your hamstrings may feel less tight after a cardio-yoga class if you're alternating mountain climbers with down-dogs; you'll definitely stay alert in Piloxing when dance moves are interspersed with upper-cuts and Roundhouse kicks.
Keep in mind: Even though aqua cycling doesn't require that you know how to swim and dance-yoga welcomes the inflexible as well as the super-bendy, total newbies might want to talk to the instructor one-on-one before class starts.
Next: 8 ways to get a better body in 30 minutes or less