Prior to moving to the College of Charleston, Ivy played
badminton. Lacking a strong badminton scene at Charleston, Ivy developed an interest in
sport cycling. and the next day won the
UCI Masters World Track Cycling Championship in the Women's Sprint 35–44 age bracket, becoming the first transgender world champion in track cycling. Some in the sports world expressed their
belief that her birth sex gave her an unfair advantage. American cyclist Jennifer Wagner, who finished third (bronze), said Ivy's birth sex gave her
physiological advantages. The second-place (silver-medal) winner, Dutch athlete Caroline van Herrikhuyzen, supported Ivy. Ivy argued that there was no evidence that being born male gave an advantage in the race and that she had lost to Wagner in the past. British columnist
Katie Hopkins wrote that the decision to allow Ivy to compete was evidence that "the world is gripped by a febrile madness". Tennis player
Martina Navratilova said that allowing people born male to compete in women's sports was "insane" and "cheating". Ivy criticized Navrátilová's comments as
transphobic. Ivy cited one of the fundamental rules of the
International Olympic Committee that the practice of sport is a human right. Some commentators felt that Ivy had an advantage because of her size and muscle mass. Ivy objected to this criticism: she must keep her
testosterone level low as a prerequisite for her participation in sports competitions. In response, she received a number of death threats, and was targeted on Twitter by
Donald Trump Jr. In December 2019, she wrote an op-ed in
The New York Times about this experience. Ivy changed her name from Rachel McKinnon with an announcement on Twitter on December 4, 2019 ==Controversy==