The Rihanna 20-Minute Butt Workout

    Rihanna on a stage wearing short shortsExactly how does Rihanna keep her butt in such cover-worthy shape?

    According to her trainer, Harley Pasternak, here are some of her top glute moves.

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    Aim for three sets of 20 to 25 repetitions of each exercise, says Pasternak. And don’t forget to add in 30-45 minutes of cardio at least three times a week.

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