You're about to lace up your running shoes, throw on your swimsuit or get on your bike. But in the same 30 minutes or so you can try a challenging new workout with interval training.
It's a fabulous fat-burning workout that involves peppering your regular workout with short, strenuous bursts that keep your heart rate up and burn more calories. Not only does interval training boost your fitness level by nudging you out of your comfort level, it also spices up your workout. You simply take the pattern -- repeated bursts of strenuous activity followed by low-intensity recovery periods -- and weave it into any program.
Caution: Intervals aren't for everyone. Don't do intervals if you have a heart condition, high blood pressure, a joint injury, are pregnant, have been advised by your physician to stick with moderate-intensity exercise or have just begun a fitness program. If you are uncertain, check with your physician before stepping up the pace of your workout.
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