"I'm so fed up of being overweight," Ozzy's son told trainer Mike Weeks in March. Six months later and 47 lbs. (22 kg) lighter, he would be fit enough to climb El Capitan, a 3,000-ft. granite wall in Yosemite. How he did it: kickboxing and giving up Oreos and Pop-Tarts for vegetables and fish. Says mum Sharon Osbourne: "Miracles do happen."