The lowest point of his career occurred at the highest point he raced. Mexico City is surrounded by mountains and is over 7,000 feet above sea level. That the altitude would have an impact on the Games was predicted. Clarke had raised concerns himself, but had been told by the Australian sports authorities that whingeing was bad sportsmanship. Since those Olympics, however, scientists have stepped up their investigation into the link between athletic performance and altitude. This research, in turn, raises some deceptively simple questions, which have bafflingly complex answers. What counts as sport? What is its purpose: what are the rules designed to achieve, designed to measure? Where does sport end, and science and technology begin? The difficulty of these matters, and the lack of any clear principles, have made sporting authorities at times appear capricious and contradictory.