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We have no doubt that Katy Perry will be rocking the Grammys red carpet and stage this Sunday, and we know why. Her trainer, Harley Pasternak, takes us through three killer core moves for a whittled waist. Press play and learn which moves are Katy’s go-to for a tight tummy!

“Katy Perry’s Go-To Moves For Flat Abs” is categorized as “health”. This video was licensed from Grab Networks. For additional video content, click the “video” tab at the top of this page.

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