Caster Semenya

What is “differences of sexual development,” and how do the rules affect women’s track and field? An explainer.

A new petition is going around as the South African athlete continues to challenge the World Athletics ruling preventing her from competing.

These 20 women are the game changers, rule breakers, and trailblazers for the next year in running.

Check out Erin Strout's author page.

The two-time Olympic champion cites human rights in her refusal to take testosterone-lowering drugs to compete in certain events.

The Olympic champion dominated the Doha Diamond League race on Friday, just two days after losing an appeal to continue competing in her event without medically decreasing her testosterone level.

Olympic gold medalist Caster Semenya fought the sport’s policy that sought to curb women's naturally occurring testosterone levels in order to compete.

The Olympic champion, currently in a legal battle with the sport’s governing body, is one of the most influential people of the year.

Six of the women featured in Sports Illustrated’s annual “Fittest 50” list are among the running world’s brightest stars.