Caster Semenya, the South African Olympic champion runner, has appealed to the European Court of Human Rights to end "discriminatory" testosterone limits imposed on female athletes. Semenya is hyperandrogenous -- meaning she has naturally high levels of the male sex hormone -- and is fighting against new rules introduced in 2019 by track and field's governing body World Athletics (previously known as the IAAF) that regulate levels of the hormone in female athletes. World Athletics said the rules were about "leveling the playing