We tried the Rumble boxing workouts that Justin Bieber swears by

Nick Fernandez, Fabiana Buontempo, Kevin Reilly

  • Rumble boxing is a celebrity-favourite workout.
  • The New York-based workout class is popping up rapidly all over the US.
  • INSIDER’s Fabiana Buontempo and Kevin Reily visited a studio to see what the hype is all about.
  • Visit INSIDER’s homepage for more stories.

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