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Health.com: How to Slim Down at Any Age

Your 30s: Get Intense

What 30-something woman has an hour to spend at the gym? No worries. To get the most bang for your time-starved buck, try interval training—alternating short bursts of high-intensity exercise with short recovery periods. Women who did intervals for 20 minutes crushed three times as much fat as those who worked steadily for 40 minutes, a study from the University of New South Wales found. Try it on the treadmill or elliptical, or during your morning walk.

(Photo Credit: iStockphoto)
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