Rules on testosterone levels for women athletes have kept star runner Caster Semenya out of the Tokyo Olympics. At the heart of this heated debate: Who should be considered a woman in sport?
Male and female athletes compete in separate categories because of advantages that come with testosterone. But what should be the rules for women who have naturally high testosterone levels?
The South African track star had sought to have new regulations about permissible testosterone levels in female athletes declared invalid. But Semenya says she "will once again rise above."
