What: New to the dance-inspired workout scene, Doonya is a Bollywood-dance style cardio class. The workout mixes Indian folk, pop and classical dance with aerobics and conditioning. The amazing soundtrack inspires you to shake it all class long (and burn anywhere from 600-800 calories). If you've ever seen a Bollywood movie, you know these dancers are having a great time, and they're also working up a serious sweat. The class has a similar pace to zumba: You mimic the instructor's movements, and as long as you're willing to keep moving and jumping to maintain your heart rate, it doesn't matter if you struggle with following the sequences.

Where: Classes offered at dance studios and gyms in NY, LA, and DC. Check DVDs.

Why: You've seen the last scene of Slumdog Millionaire. 'Nuff said.

Who: Zumba addicts, Bollywood film fans jonesing for fitness

What: Surfing is an awesome all-around workout ... just take a look at Karina Petroni or Malia Jones for reference. Surfset & Sand gives you the benefits of surfing, minus the ocean. You paddle, pop up and literally surf on a stabilized surfboard that moves back and forth like it's in the water. The class combines these surf sequences, with planks, pushups and other core work and strength training on the board. You also finish a sequence of toning exercises using a sandbag as both a free weight and a sliding disc. Don't worry, you won't need the balance of a prima ballerina or pro-surfer in order to take the class; the balance level is something similar to what's required in a Pilates class with a reformer, or a warrior sequence in yoga.

Where: Crunch Gym

Why: After this class, you'll look great in a bikini. Also, they play the Beach Boys and the instructors occasionally dress up as lifeguards.

Who: (Wannabe) surfers, core workout/Pilates junkies, and beach lovers

What: It's a classic spin class with a do-gooder twist: For every class you take, Cycle House donates two meals to the hungry. Cycle House is also eco-friendly: no printed schedules, receipts or bottled water enter this spin studio. (You can BYO bottle to fill from the studio's alkaline water filter system.) Fittingly, the bikes are green and the lights are dim. But they definitely don't skimp energy on the music -- expect a pumping soundtrack with a full-body spin routine.

Where: West Hollywood, CA

Why: Who doesn't love working out for a cause?

Who: Spin class addicts, TOMS-wearers, sweat enthusiasts, and multitaskers

What: "Dance Motivation Fitness" isn't your typical dance-based cardio workout. It's also a far cry from the standard "no pain, no gain" mantra of tough fitness instructors who bark commands, taunt, and push the boundaries to motivate. DMF instructors are all about the warm fuzzy (think: inspirational coaching), complimenting women on moves they do well and offering kind words encouragement. Each song -- which ranges from hip hop to salsa to pop -- has a choreographed sequence designed to pump up your heart rate, and the instructor's feel-good vibe really instills the full body-and-mind experience in each class.

Where: DMF Studio in New York, NY

Why: Non-stop cardio with positive reinforcement! It's a win/win.

Who: Zumba lovers, cardio class beginners, social types, free spirit movers, and anyone who doesn't jive with the drill instructor routine in a fitness class