Short on time? Then this is the workout for you. Autumn Calabrese, creator of the 21-Day Fix (21DayFix.com), shortened her signature Dirty 30 Workout just for us. It may only be 15 minutes long, but every second is designed to tone you all over while keeping your heart rate up. Yep, you're about to burn significant calories while building metabolism-boosting muscle.

POPSUGAR Fitness offers fresh fitness tutorials, workouts, and exercises that will help you on your road to healthy living, weight loss, and stress relief. Check out Class FitSugar, our do-it-along-with-us real-time workout show hosted by Anna Renderer who will inspire you to sweat alongside fitness experts and Hollywood’s hottest celebrity trainers. Class FitSugar regularly covers the most buzzed-about workout classes and trends, including the Victoria's Secret workout, Tabata, P90X, Bar Method, and more.

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