The famous Mexican ultramarathon festival known as Caballo Blanco (White Horse) pits outsiders against Indigenous runners in Urique, Chihuahua state. In its 20th year, the weekend attracts 1,200 people of all ages to compete in the races, the longest of which is a 50-mile ultramarathon. Many of the local Raramuris, or light-footed ones, test their renowned endurance against athletes while wearing simple sandals, known as huaraches and often made of discarded car tyres