Katy Perry's go-to move for flat abs

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Katy Perry's go-to move for flat abs
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!
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