Mark Zuckerberg loves MMA so much that he's rented out entire arenas, sparred on a barge , had major surgery to fix a fighting injury, won medals , and built a "backyard" octagon at his Ko'olau Ranch compound in Hawaii. And according to a new book by the former president of global affairs at Meta, Zuckerberg even asked some company leaders to get on the mat.

"Mark's commitment to MMA is so strong that he insisted one morning, during a management offsite, that some of his most senior executives join him for a training session," wrote Nick Clegg in his soon-to-be-released book, How to Save the Internet (Penguin; November 11, 2025).

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Fast Company reports that, in the book, Clegg details one particularly unco

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