What is the secret of great athletes, legends, who dominate and capture the hearts of spectators and even whole communities? In this show around the IAAF World Athletic Championship 2017 in London, UK, we take a closer look at two athletes at either end of their careers, Dina Asher-Smith and Usain Bolt - What do they both have in common? Could there be something so profound, and powerful, that has the potential to change the world of elite & professional sport forever?