Top Celebrity Trainers Share the Weirdest Ways Stars Work Out: Fitness Secrets - Bloomberg

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Beachbody, the Folks Who Brought You Paul Ryan's Abs - Bloomberg

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Celebs Working Out: Pics Of Stars Exercising – Hollywood Life

This subreddit is mentioned in a Bloomberg Businessweek article talking about the recent Duolingo update. : r/duolingo

The Rise of Celebrity Trainers: How Boutique Fitness Instructors Became Superstars, by Fitt

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