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Published on 17 Nov 2014 | about 1 year ago

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.

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