les fous du velo - C'est pas sorcier

Fred and Jamy take us into the world of professional cycling during a stage of the Tour de France. With his innate sense of sacrifice… Fred has decided to take on the challenge! The mechanics of a Tour team find him a bike for his journey and explain how to choose one based on his height and weight. We follow a mountain stage on a motorcycle and meet with him the doctors in charge of doping controls at the end of the stages. What is the gearing of a bicycle? Why do we need to balance on a moving bike? What allows our body to produce intense physical effort?