Cardio vs. Strength Training - which one rules?

Cardio's edge Calorie for calorie, cardio has a slight advantage. You'll burn 8 to 10 calories a minute hoisting weights, compared with 10 to 12 calories a minute running or cycling, says Wayne Westcott, Ph.D., director of research at the South Shore YMCA in Quincy, Massachusetts.

Strength's edge Lifting weights gives you a metabolic spike for an hour after a workout because your body is trying hard to help your muscles recover. That means you'll fry an additional 25 percent of the calories you just scorched during your strength session, Westcott says. "So if you burned 200 calories lifting weights, it's really closer to 250 overall." And if you lift heavier weights or rest no more than 30 seconds between sets, you can annihilate even more.

And there's more good news when it comes to iron's fat-socking power. "For every 3 pounds of muscle you build, you'll burn an extra 120 calories a day -- just vegging -- because muscle takes more energy to sustain," Westcott says. Over the course of a year, that's about 10 pounds of fat -- without even changing your diet. Yes, please.

Winner: Strength Training!