This Sunday, he will be the attraction of the Drôme marathon in Saint-Paul-les-Romans. With a small team of friends who will come to film him throughout the course, Guillaume de Lustrac will not go unnoticed. Normal, the young man of 29 years, from Maisons-Laffitte in the Yvelines, will run for the 42.195 km like all the others. Except for one small detail, Guillaume will run backwards! It’s not a fad, but just the consequence of a lost bet with his friend Duncan Perrillat, the reigning French marathon champion.