Oct 25, 2025 Failed to save article Please try again Parents, children and supporters march to Gov. Gavin Newsom's home in Kentfield in support of trans youth rights on March 31, 2025. (Aryk Copley for KQED) Experts have said athletic ability varies greatly across gender, based on many factors not exclusive to sex assigned at birth. And scientific reviews, including one by the Canadian Centre for Ethics in Sport, show biomedical factors related to puberty do not predict athletic performance.