We have Jane Fonda to thank for popularizing this group class format featuring music with a beat, dance-style choreography and a whole lot of sweat.

Gone are the days where all participants don striped leotards and bulky leg warmers -- though there are still a few around. Today there is a class for every body, size, age and style. From step to salsa, you'll find a class that inspires you to burn calories and whip your heart and lungs into shape while having a great time.

In addition to promoting camaraderie, the group format increases motivation. This is a notable attraction for people who have trouble sticking to a fitness program or don’t like solo activities.

Cardio dance classes are often offered in three categories: low-impact (most suitable for beginners), intermediate (improving basic cardiovascular health) and high-impact (a hard workout for advanced exercisers). Starting at an inappropriately high level will increase your risk of injury, but taking a class that’s too easy for your level of fitness won’t increase your heart and lung power.

Many types of cardio dance classes are available. Some focus only on the cardio workout, but others have incorporated strengthening and flexibility exercises as well.

• A good class is like a fabulous party. You can't stop dancing and you find yourself drenched in sweat even if you've previously had an aversion to exercise.
  
  
• There can be a sense of camaraderie with other students if you all take the same class often. You and your dance buddies will spur each other on.
  
  
• A good instructor will emphasize the importance of warming up and cooling down, two things that many solo exercisers forget to do.
  
  
• When you nail down the proper techniques from classes, you can feel more comfortable exercising at home along to a cardio dance DVD or TV program.
  
  
• Some people find cardio dance so much fun that they get hooked on physical fitness and branch out into other exercises they might otherwise not have explored.

• Classes offer generalized instruction rather than individual.
  
  
• If you are a serious athlete or serious couch potato, it may be difficult to find a level to suit you.
  
  
• Increased repetition of the same movements in the same class increase your risk of injury -- you need to understand your limitations before leaping into a Cardio Blast Off or other advanced classes, especially if you've been injured or have any medical conditions.
  
  
• Not all instructors are motivational or pay enough attention to safety.