"Why do I have to compete against a male body?" complains mountain bike racer Leia Schneeberger in my new video. She and others are upset because today, some transgender women, people born male but who identify as female, are winning sports competitions. Schneeberger regularly won bicycle races, until a former men's cyclist transitioned, competed as a woman, and rode away from her. "How did this happen?" asks Schneeberger. "I just want to be able to compete on a fair playing field." But no playing field is perfectly fair, says trans athlete Joanna Harper. Harper is also a scientist who advised the Olympic committee. She points out that transgender competitors often take testosterone blockers that help align their body with how they identify. As a result, "Trans women lose muscle, lose strength, lose endurance."