We're huge fans of running. It allows you to get a stress-reducing, endurance-boosting workout with just a pair of shoes and an open road.
It also burns calories, of course. At a 10-minute per mile pace—roughly the average guy's marathon pace—you'll fry about 10 calories a minute.
That's a solid number, and if you run faster, you can burn even more.
But if running isn't your favorite activity, there are plenty of other modes of exercise that can help you torch calories at a lightning fast rate.
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"In general, you burn more calories by doing high-intensity weight training than you do running," says Harold Gibbons, a trainer at Mark Fisher Fitness in New York City, and the New York State Director of the National Strength and Conditioning Association.