What is it really like to be a racer? What is it like to be swept along at 60kmh in the middle of the pack? How does it feel to be reeled in from a solo breakaway metres from the line? What happens to the body during a high-speed chute? What tactics must teams employ to win the day, the jersey, the grand tour? How does a domestique keep going to the end of a stage once his job is done and his body exhausted?