Ready to Sweat? Take This Metabolism-Boosting Circuit Workout to the Gym

Not every workout has to be a no-holds-barred sweat fest, but we're not going to lie: those days when you crush it at the gym are the ones that are going to help you see results fast. So pound that pre-workout shake, and take this hour-long workout with you the next time you want an effective workout. The intense workout is one of The Biggest Loser: Australia trainer Michelle Bridges's secrets for burning calories fast, and it's not for beginners. This particular workout from Michelle's newest b...