RUMBLE® is the HOTTEST new mixed martial arts cardio workout. 🔥 It's taking GROUP X and gyms by storm! Whether you're a certified trainer, or you've never taught a class, all you need to become a certified RUMBLE® Instructor is PASSION! We have one-day certifications courses in YOUR neighborhood! https://www.rippedplanet.com/rumble-certification/ | R.I.P.P.E.D.