Nike is celebrating the 40th anniversary of Title IX with an ad called "Voices." Using the hashtag #maketherules, female athletes — Olympic boxer Marlen Esparza, women's basketball legend Lisa Leslie, WNBA star Diana Taurasi, and Joan Benoit Samuelson, who won the world's first gold medal for women's marathon at the 1984 Olympics — unflinchingly look into the camera and reveal the obstacles they've faced. Samuelson says, "When I was growing up, girls just didn't run in public," and you realize how far we've come. But then Esparza says, "I'm a girl… that doesn't mean I have to wear a skirt," and you realize how much work we still have to do.