Britney Spears “I’m A Slave 4 U” Cardio Hip Hop

By The Fitness Marshall October 7, 2015

Ready to get your heartbeat up? Britney Spears never goes out of style in my book. Fit in some cardio today to her classic “I’m A Slave 4 U” as I guide you through a dance workout.

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*This video was originally published on The Fitness Marshall’s Youtube channel. For more workout videos visit

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