'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.  For more, visit: https://www.rumble-boxing.com/  MORE FITNESS CONTENT: How This Celebrity Trainer Helped The Cast Of \'Riverdale\' Get Ripped | Movies Insider https://www.youtube.com/watch?v=gYvI0n6zrHs How Athletes Will Train In The Future https://www.youtube.com/watch?v=V3moQvLYByQ What It Takes To Be A Contortionist For Cirque Du Soleil https://www.youtube.com/watch?v=9HRkMWHhnoQ  ------------------------------------------------------  #Rumble #Boxing #INSIDER  INSIDER is great journalism about what passionate people actually want to know. That’s everything from news to food, celebrity to science, politics to sports and all the rest. It’s smart. It’s fearless. It’s fun. We push the boundaries of digital storytelling. Our mission is to inform and inspire.   Subscribe to our channel and visit us at: https://www.insider.com INSIDER on Facebook: https://insder.co/2NyYczE INSIDER on Instagram: https://insder.co/2K8WGS0 INSIDER on Twitter: https://insder.co/2xyN5wE INSIDER on Snapchat: https://insder.co/2KJLtVo INSIDER on Amazon Prime: https://insder.co/PrimeVideo INSIDER on Dailymotion: https://insder.co/2vmKnZv  We Tried The \'Rumble\' Boxing Workout That Justin Bieber Swears By' 

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