After 40 years helping some of the greatest gymnasts of all time soar to Olympic gold - from Nadia Comaneci to Mary Lou Retton to Nastia Liukin - Martha Karolyi is ready to say goodbye. The U.S. women's national team coordinator is retiring after the 2016 Games.The five-woman group Karolyi is bringing to Rio de Janeiro - Simone Biles, Gabby Douglas, Aly Raisman, Madison Kocian and Laurie Hernandez - has the perfect going away present in mind: Gold.