Less than 150 Brazilians or 0.00001 percent of the national population completed the challenge that our author Sara Velloso concluded between 2011 and 2019. She ran the six biggest and most traditional marathons in the world crossing the finish line always before the deadline in the cities of Berlin, Boston, Chicago, London, New York and Tokyo. This challenge is called Six Majors, something like the "six major ones", in free translation. On this route, Sara not only won the challenge to cover the 253 kilometers and 170 meters in more than thirty hours on the main streets of these metropolises.She overcame her fears, recalled her stories, reviewed the victories and defeats of which life is made, and in crossing the final line of each of the marathons she found redemption and love, also so necessary to her own existence. It is these moments, kilometer by kilometer, that Sara shares with us. The reader of "Six Races" will discover what the body and mind of a marathon runner is made of and, during the course, will also learn many curiosities about the cities and the stories of these marathons that gather hundreds of thousands of people from all over the world every year.