Caster Semenya’s career might soon be over. The International Association of Athletics Federations has announced new eligibility rules for women’s competitions, affecting running races between 400 meters and one mile. The regulations, which place limits on natural testosterone levels and androgen sensitivity, will come into effect on Nov. 1, and are expected to significantly impact athletes like Semenya who do not seem to fit neatly within the binary classification of male and female.
Semenya burst onto the international circuit as a South African 17-year-old in 2008, winning the 800-meter track races at both the World Junior Championships and Commonwealth Youth Games.