Meta CEO Mark Zuckerberg took to Instagram to reveal that he completed the Murph workout challenge in 39 minutes and 58 seconds. The challenge includes running one mile, doing 100 pull-ups, 200 push-ups, 300 squats, and then running another mile while wearing a 20lb (or, 9kg) vest. "That last push to get under 40 mins was brutal!" Zuckerberg said.