Get a sneak peek at Kayla Itsines' new book—and how she stays motivated

Kayla Itsines is arguably the most influential trainer in the world, who has inspired millions (8.1 million on Instagram alone) to embrace the Aussie fitness phenom's heart-pounding, strength-building Bikini Body Guide workouts on her Sweat app—and of course, post the results on social media for fellow ...

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