Nowhere has the symbolic power of the Black Lives Matter movement been more evident than in the sports arena. All too often racism undermines the notion of a level playing field. HARDtalk’s Stephen Sackur speaks to an athlete who made a stand. Adam Goodes was a star player in Aussie Rules football. One of the greatest ever players of Aboriginal descent, he quit the game after years of racist abuse. What lessons can Australia and the wider world learn from his experience?