Who gets to compete? Since the beginning of women's sports, there has been a struggle over who qualifies for the women's category. A Martinez speaks with Rose Eveleth, the host of a new podcast series called Tested from NPR's Embedded and CBC in Canada, which traces the surprising, 100-year history of sex testing in elite sports. The series follows the unfolding story of elite female runners who have been told they can no longer race as women, because of their biology. They face hard choices: take drugs to lower their natural testosterone levels, give up their sport entirely, or fight. Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy

Less than 90 days until the November election, both Presidential campaigns are in full force. A look back on changes in law enforcement and activism since the police killing of teenager Michael Brown, Jr. in Ferguson, Missouri a decade ago, and U.S. track and field athletes have big night at the Paris Summer Olympics. Want more comprehensive analysis of the most important news of the day, plus a little fun? Subscribe to the Up First newsletter. Today's episode of Up First was edited by Megan Pratz, Lindsay Totty, Russell Lewis, Janaya Williams and Alice Woelfle. It was produced by Ziad Buchh, Nia Dumas and Julie Depenbrock. We get engineering support from Carleigh Strange. And our technical director is Zac Coleman. Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Privacy Policy