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News flash: Dumbbells can make fat disappear even when you're not hoisting them. Strength-training reps helped exercisers melt 79 percent more calories in the hour post-workout than those who hadn't lifted, a study from Arizona State University found. "Think of that afterburn as your metabolism working overtime while you lounge," says celeb trainer Brian Nguyen, the owner of Brik Fitness in Redondo Beach, California. To stoke your inner-cinerator, grab a set of weights (try 10- to 12-pounders) and do Nguyen's carve-you-up combo.