Hailing from one of the world's poorest countries, Nigerien sprinter Aminatou Seyni is no stranger to life's hurdles, but as she prepares for the Tokyo 2020 Olympics, the 23-year-old faces fresh obstacles.
Despite clocking the fifth-fastest time in the 400 metres last year, Seyni may not be able to compete in her favoured event because she refuses to take hormone suppressants for elevated testosterone levels.