Last July, the Tour de France was abuzz with talk around carbon monoxide (CO) inhalation, with both Tadej Pogačar and Jonas Vingegaard confirming their previous use of the controversial but legal practice.
An Escape Collective investigation towards the end of the Tour’s second week introduced the concept of CO inhalation to the wider public, detailing how athletes across various sports are turning to the technique to optimise their altitude training and potentially improve their body’s blood levels.
