USUS·CBS NewsAfter an MS diagnosis, this man started running marathonsDerek Stefureac has reversed the progression of his multiple sclerosis by embracing exercise, doctors said.Lean LJun 11Read at CBS News→USUS·CBS NewsAfter an MS diagnosis, this man started running marathonsDerek Stefureac has reversed the progression of his multiple sclerosis by embracing exercise, doctors said.Lean LJun 11Read at CBS News→