I Am A Woman": Track Star Caster Semenya Continues Her Fight to Compete As A Female

This week, the Olympic champion runner Caster Semenya of South Africa filed an appeal in a case that hinges on her right to compete as a woman. It's the latest chapter in a fight that's gone on for years, and that raises thorny questions about fairness and ethics in sport.

Semenya, 28, is a two-time gold medalist in the 800 meter event. She is asking the Swiss Federal Supreme Court to throw out a ruling issued earlier this month by the Court of Arbitration for Sport, or CAS, which is based in Lausanne.

That ruling upheld regulations that will require some female track athletes with naturally-elevated testosterone levels to lower those levels with drugs or surgery, if they want to compete in certain women's events on the international stage.

Just two days after losing that court fight, Semenya