Celebrity trainer Harley Pasternak, author of the best-selling book The 5 Factor Diet, went on The Today Show last week and dished his secrets to helping Lady Gaga get her rock-hard abs.

Just before Gaga performed at this year’s MTV MVA award ceremony, Harley was with her backstage, working out! Why? Harley says when you’re wearing a costume like Gaga’s, working out just gives you that added boost to make you look and feel super confident.

When it comes to working out with Gaga at home, Harley begins with a basic crunch. You can add variety to the very basic exercise by moving into a reverse crunch – lifting your knees towards your forehead using your abs. And if you really want, you can combine the two into a double crunch – lifting both ends of your body towards your center.

“It’s not just about doing abs exercises,” Harley said on the show. “It’s mainly about eating the right foods, doing the cardio and burning the fat on top of the abs.”

Harley also dished on Alicia Keys’ back exercises, which build a strong, sexy and sleek back as well as Vanessa Williams‘ barbell arm exercises and Jessica Simpson’s bench stepovers for limber legs.

Watch the full video here.

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