Boxing legend Muahmmad Ali was hospitalized with pneumonia onSaturday. The 72-year-old American sports icon and three-time world heavyweight champion is being treated at anundiagnosed location. "Muhammad Ali... is being treated by his team of doctors and is in stable condition," Ali's rep said in a statement. "He was admitted earlier this morning and because the pneumonia was caught early, his prognosis is good with a short hospital stay expected." Ali has suffered from Parkinson's disease since 1984 and has become an advocate for people with the illness.