Revisited: the danger – and beauty – of ultrarunning

After 21 competitors died during a 100km mountain race in Gansu province earlier this year, the Chinese government suspended all extreme sports. But those who love ultrarunning insist it can be safe – and has changed how they see the world. What keeps them coming back?. Help support our independent journalism at <a href="https://www.theguardian.com/infocus">theguardian.com/infocus</a>