Gymnast Nadia Comaneci hopes her part in "Symphony of Sports," a musical-athletic show on NBC, will jump-start her career. Comaneci was the darling of the 1976 Olympics but became fodder for the tabloids when she took up last year with a married man who helped her defect from Romania. "I want people to get to know me and see I am not a cold one," she said. "I am an open, warm person. It is exciting to show another side of me beside what they saw in the Olympic Games. After living under communism it is not easy to be warm and friendly and relaxed like Americans." Comaneci says she enjoyed making "Symphony of Sports" and likes her new lifestyle. "I like to perform, but I didn't have the chance when I was competing," she said. "When you compete as an athlete for a communist country, it is very serious. You don't win gold medals with smiles."