Elon Musk is already hitting the training mats in anticipation of his huge fight with Mark Zuckerberg ... throwing and slamming a famous black belt who recently trained with Elon's fellow billionaire.
Popular podcaster Lex Fridman says he had an impromptu training session with Elon on Monday, sharing a photo of Elon slamming him to the ground.
Lex, a black belt in jiu-jitsu, says he came away super impressed with Elon's fighting prowess.