Retired undefeated former pound-for-pound king Floyd Mayweather was on hand in Moscow, Russia where he held an open workout and set a Guinness World Record for the world's largest boxing lesson. Check out the scene as thousands of fans showed up in attendance. The original record for the largest boxing lesson involved 508 people and was achieved by Fight Klub (UK) in Hatfield, Hertfordshire, UK, on 13 September 2014.. Though we have yet to confirm the official number, our understanding is that Mayweather is being credited with nearly 800 participants (791).
