At its epicenter, Rumble is a collection of the most inspired and inspiring fitness instructors on the planet. Impressive athletes in their own regard, they step onto the podium at Rumble as part DJ, part motivational speaker, and complete Master of Ceremony. The 45 minutes that follows is an awesome orchestration of a workout engineered to custom hip-hop and house mash-ups. The music, the lights, the program, and the collective heartbeat of the room all come together as if it was a collaboration from the beginning. The 10-round fight is every divided between two styles of training. Half the class is spent exploring the skills and drills of boxing, and the other half is spent on the transformative power of resistance training.