Musk has trolled Zuckerberg with messages on Twitter, telling his fans this week: "I'm up for a cage match if he is lol."
Zuckerberg, who has followed the trend of tech bosses getting buff and posting martial arts videos, responded on Wednesday.
Tech titans Mark Zuckerberg and Elon Musk are in a fierce business rivalry that has spilt over into a playground spat, with the two men offering to fight each other in a cage.
Months after Musk took over Twitter, Zuckerberg's Meta hinted it was planning to launch its own text-based social media platform -- essentially a direct rival.
