The governing body of cycling, UCI, has officially banned the controversial practice of carbon monoxide rebreathing, citing health concerns for athletes. This decision aims to protect the health and safety of cyclists, as the use of carbon monoxide has raised significant concerns within the sport. The ban follows discussions about the potential appeal of this method to those seeking performance enhancements and comes as a response to recent incidents and inquiries surrounding its usage, particularly highlighted during the Cyclo-Cross World Championships.