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The IOC initiated a review process to test for endogenous testosterone levels in women in the wake of South African runner Caster Semenya’s gold-medal performance in the 800 metres at the 2009 world championships. Her dominating victory, as well as her muscular build and deep voice, led to speculation she wasn't actually female.

London 2012: IOC gender testing policy challenged

The IOC initiated a review process to test for endogenous testosterone levels in women in the wake of South African runner Caster Semenya’s gold-medal performance in the 800 metres at the 2009 world championships. Her dominating victory, as well as her muscular build and deep voice, led to speculation she wasn't actually female.

U.S. sprinter Allyson Felix won three gold medals at the 2012 Olympic Summer Games in London—the most ever for an American woman in track and field

U.S. sprinter Allyson Felix won three gold medals at the 2012 Olympic Summer Games in London—the most ever for an American woman in track and field

Ryan Hall. He always give's praises/thanks to the Lord after he finishes a marathon, whether he wins or not. But, here he qualifies for the Olympics :D

Ryan Hall. He always give's praises/thanks to the Lord after he finishes a marathon, whether he wins or not. But, here he qualifies for the Olympics :D

Ethiopian+women+running+the+3000+meter+race | Women's 10,000 Updates - 2012 London Olympic Games | News - Flotrack

Ethiopian+women+running+the+3000+meter+race | Women's 10,000 Updates - 2012 London Olympic Games | News - Flotrack

Dalilah Muhammad of the United States celebrates winning gold in the Women's…

Dalilah Muhammad of the United States celebrates winning gold in the Women's…

Allyson Felix from 2016 U.S. Olympic Portraits  Sprinter

Allyson Felix from 2016 U.S. Olympic Portraits

Team GB's youngest athlete Amy Tinkler wins bronze in gymnastics at Rio Olympics | Daily Mail Online

Team GB's youngest athlete Amy Tinkler, 16, wins bronze in gymnastics

Team GB's youngest athlete Amy Tinkler wins bronze in gymnastics at Rio Olympics | Daily Mail Online

Meseret Defar at Istanbul indoor championships 2012

Meseret Defar at Istanbul indoor championships 2012

East African Runners are Forefoot Runners Not Heel Strikers http://runforefoot.com/east-african-runners-are-forefoot-runners-not-heel-strikers/

East African Runners are Forefoot Runners Not Heel Strikers http://runforefoot.com/east-african-runners-are-forefoot-runners-not-heel-strikers/