We Tried The ‘Rumble’ Boxing Workout That Justin Bieber Swears By

From Insider.

Rumble boxing is a celebrity-favorite workout. The 45-minute class is a mix of boxing and strength training. Rumble is taking the group-fitness trend by storm, and we were eager to see what the hype is about.

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We Tried The ‘Rumble’ Boxing Workout That Justin Bieber Swears By