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Jack Osbourne grew up in the public eye on MTV’s Meet the Osbournes, so we all watched as he transformed from a troubled teen with substance abuse issues to a healthy, happy family man. But when Osbourne was diagnosed with multiple sclerosis in 2012, his health became even more of a priority. He turned to CrossFit and a "pretty insane" regimen of vitamins and hormone therapies to manage his symptoms. "Right now am I going to be in a wheelchair? No," he says. "But if I don't take care of myself, who knows?"
See which stars turn to this intense workout to stay in amazing shape
See which stars turn to this intense workout to stay in amazing shape.