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The Fit 5: Tips to Feel (and Look) Like a Star!

From Katherine's back-building workout to Queen Latifah's healthy philosophy, get the scoop on how to look fab like the stars


John Mayer keeps his workouts high in energy and low on time. "He's not a gym rat so we get him in and out really quickly," says trainer Harley Pasternak. Mayer's lean muscles owe it all to Pasternak's 5-Factor Diet and Fitness Program – a multi-phase workout including upper body, lower body, abs, cardio and cooldown. The best part? His circuit can be completed in as little as 25 minutes. Want a trimmed-down – but still effective – workout? Read about's fast-track plan. – Amy Elisa Keith