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"Swift motions and jumps give your metabolism an instant kick while building muscle in the long term," says Jon Giswold, a master trainer at PUSH, an online personal-training service. Add this power-packed routine, developed by Giswold, to your regular workout three times a week -- you'll burn more than 100 calories in each 10-minute session.
Targets: Obliques, Core
Originally published in Fitness magazine, May 2005.