Amid Musk-Zuckerberg 'Cage Match' challenge, video of Facebook CEO training Jiu Jitsu goes viral, Watch

Elon Musk and Mark Zuckerberg have agreed to a cage fight, but it is unclear whether the proposal is genuine or a joke. Lex Fridman, who trains with Zuckerberg in Brazilian martial art jiu jitsu, has also expressed an interest in training with Musk.

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