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Jorge Cruise, personal trainer, says that just two exercises in the morning will up your metabolism for the rest of the day. All you need is a pair of dumbbells heavy enough to really tire out the muscle by the 12th repetition (for most women, five to ten pounds), and the 12 exercises here, which will take you through a week's worth of moves. Start off each A.M. with Cruise's one-minute warm-up: March in place, knees high, arms pumping, knuckles toward the ceiling.