Mary Lou Retton, a former Olympic gold medalist in gymnastics, has been hospitalized for a rare form of pneumonia that has prevented her from breathing on her own. Her daughters have shared updates on her condition on their Instagram stories and have set up a crowdfunding page to help cover her medical costs. Pneumonia is a common illness that causes more than 50,000 deaths and a million hospitalizations each year in the US. Mary Lou Rettons family has recently reported that she is making "remarkable" progress in her battle with pneumonia.