US cyclocross champion reveals she retired from sport over emergence of transgender athletes in women's sports

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Hannah Arensman, a 35-time winner on the national cyclocross circuit, revealed in an amicus brief filed to the Supreme Court last week that she retired from the sport after finishing in fourth place in between two transgender females.

The brief was filed in support of the state of West Virginia and its Save Women’s Sports law. The legislation seeks to keep transgender student-athletes at all level of competition to play against those with the same biological gender instead of the gender they identify as. A preliminary injunction dissolved in January when a federal judge ruled the law did not violate Title IX protections but the 4th U.S. Circuit Court of Appeals ruled to reinstate a preliminary injunction.

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Hannah Arensman cools down after the Junior Women's Individual Time Trial during Individual Time Trial during day two of the UCI Road World Championships on Oct. 10, 2016 in Doha, Qatar. (Bryn Lennon/Getty Images)

Arensman was one of 67 athletes, coaches and family members who called on the Supreme Court to vacate the preliminary injunction. In the brief, Arensman said she had retired from the sport and cited an incident at the USA Cycling Cyclocross National Championships in December.

"I was born into a family of athletes. Encouraged by my parents and siblings, I competed in sports from a young age, and I followed in my sister’s footsteps, climbing the ranks to become an elite cyclocross racer," her message read. "Over the past few years, I have had to race directly with