Biggest Loser contestants are doing it, celebrity trainers do it, NASCAR drivers do it, pro sports teams are incorporating it into their conditioning programs. Here are five reasons why you should try it.

Interval training maximizes your efforts and gets you results. Your health is your wealth! Feel good, look sexy. Give me 15 minutes, and I'll get you summer body ready.

High-intensity intervals can be classified as brief exertions of maximum output, usually in the range of 20-40 seconds of intense activity, followed by a designated resting or recovery period. You could complete an entire high-intensity workout with minimal equipment in 20 minutes or less.

Years ago, I had a workout plan and I followed it to the letter. But these days, almost never do I go to the gym and do the workout I plan to do.

Ditch the idea that when it comes to exercise, longer is better. Enjoy quick workouts -- and your extra time!

If you can only find 30 minutes (or less) to fit in some exercise, what's the best use of your time -- a cardio workout or a weight training session?