Rumble trainer Julia Stern: Ep. 96

Rumble is the fitness class taking America by storm, with celebs like Justin Bieber, Kendall Jenner, and Kevin Hart all taking it. Trainer Julia Stern talks about why it’s so successful, what Rumble can do to avoid being a fitness fad, and what a typical day and week are like for trainers. You’ll learn it’s no surprise she has a six-pack.

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