The Rihanna 20-Minute Butt Workout

Exactly 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.

1. Curtsey Lunge: Stand with your feet together, then take a large lunge backward with your left leg, moving your leg diagonally behind you as you lunge. Repeat with your right leg, and continue to rapidly alternate between legs until you finish your set. If you’d like to modify this exercise, try a stationary reverse lunge, continuing to alternate your legs.

2. Step-Ups: Using a chair or a bench, step up with your left leg, simply bringing your right leg along with you, and then lead with your left leg on the way back down. Do all your reps on the left side, then switch to the right and start again.