Mary Lou Retton is a fighter. The Olympicwinning gymnast and her daughter, Shayla Schrepfer, sit down with 'Today's' Hoda Kotb to talk about her battle with a lifethreatening, rare form of pneumonia for the first time, which lead to her hospitalization in October. Mary Lou says they almost put her on lifesupport and she's just 'grateful' to be alive.