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79. Kayla Itsines

"I've been doing this for three years now and I'm still not used to it. I still get nervous. I worry, am I saying the right thing? Do they like me? Am I funny enough?" —Kayla Itsines

With nearly 10 million followers on Instagram, and 22 million on Facebook, Kayla Itsines is arguably the world's most famous fitness personality and trainer right now. She's the co-creator of the Bikini Body Guides (BBG) workouts (those 28-minute, deceptively tough workouts everyone's posting about on Instagram) and the brains behind the Sweat app, and she is a bona-fide global sensation. But Kayla, who is from…

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