We are excited to welcome Ross Tucker back to the show! He joined us in a special episode in January to discuss the great shoe debate, and this time we learn more about his background growing up in South Africa before turning to discuss all of the major issues of today.  Chris and Adam lead this discussion as Ross talks about growing up in a small, industrial town in South Africa. He describes how checking out the only book on running in his local library would change the course of his life and career. That book - Lore of Running by Dr. Tim Noakes - would lead him to study under Dr. Noakes at the University of Capetown before embarking on a career in sports science himself. Now, Ross is a science and research consultant for World Rugby, where he advises on issues of player safety and policy. He's also co-host of the Science of Sport Podcast where he and co-host Mike Finch regularly bring data and evidence to discuss a host of issues across sports. In this episode, we dig into a handful of those issues including the shift of the great shoe debate from the roads to the track, the Caster Semenya case, new rules from World Rugby governing the participation of transgender athletes, and of course, the latest in the world of clean sport.  Ross Tucker has an amazing ability to make complex issues very simple and easy to understand. He's also adept at arguing both sides of each issue, which often brings unique perspective to any discussion. We learn something new every time we listen to Ross speak, and this was no exception.