When it comes to getting fit, there are two things I believe in: taking classes and trying new things. This was exactly the approach I took to get -- and stay -- in white-dress shape for my wedding. In the six months leading up to my big day, I tried as many different classes as I could. I had so much fun and it kept me incredibly active.

What about you? Need a time out from the treadmill? Are you burnt out on that spin bike? Introducing a new type of exercise to your usual routine can kick-start your resolve and results. If you're in a fitness rut, consider the following classes, which are taking studios and gyms by storm. One of these types of exercise may be just what you need to get excited to sweat again!

1. If you like…competition
Try… CrossFit

What it is: In a word: Intense! CrossFit workouts are fast-paced, as you continuously move from one high-intensity exercise to the next. The exercises mostly involve fundamental actions, like running (more like sprinting!), throwing, jumping, squatting, pushing, pulling and swinging. There's a variety of equipment, including barbells, kettlebells and sandbags. The goal is to complete a certain number of reps of each exercise within a given amount of time. In many classes, participants compete against one another. Because of its high intensity, you're sure to torch tons of calories!

One warning: Because of the explosive nature of many CrossFit exercises, it's crucial to have good form before ramping up the intensity to avoid injury. If you're just starting to get in shape, jumping right in may not be your best option. Consider working with a personal trainer to learn the basics first.

Check it out: Watch these videos for demos of CrossFit exercises and click here to find CrossFit facilities in your area.

2. If you like…bodyweight exercises
Try…TRX

What it is: This "suspension-training system" contains two long straps that attach to a stable surface, like a doorframe, weight rack or tree. Using your own body weight and gravity as resistance, you can do hundreds of different exercises by holding the handles or placing your feet in the foot cradles.

Instead of isolating a specific area, these exercises work your entire body. It's great for building strength (particularly the core) and improving balance and flexibility.

Check it out: Find a trainer or a facility in your area that offers TRX training. You can also purchase your own suspension training system to use at home.

3. If you like…dance parties
Try…Zumba®

What it is: Here's what the Zumba brand calls itself: "a calorie-burning dance-fitness party." I'd say that's about right. This high-energy workout incorporates dance moves and fun music. Make sure to bring along a pack of Puffs tissues -- you'll work up a sweat while shaking parts of your body you didn't even know where shake-able.