She was only 13 when she caught the world's attention. In 2003, Bethany Hamilton lost her arm when she was bitten by a shark while surfing in Hawaii, but her determination to keep pursuing her passion inspired people everywhere. Now 29, Bethany is a professional surfer. Her story is the subject of a documentary called "Bethany Hamilton: Unstoppable." The film shows not only her comeback, but her triumph. InsideEdition.com's Mara Montalbano has more.