Skyrunning is a form of mountain running that takes place at high altitudes, typically above 2,000 meters (6,562 feet). It involves racing on steep, rugged terrain, often including sections that require scrambling or climbing. The sport emphasizes both speed and endurance, with races varying in distance and elevation gain. Competitions are organized under the International Skyrunning Federation (ISF), which sets specific rules and standards for events. Skyrunning can be divided into several categories, including Sky, Ultra, and Vertical races, each with its own unique challenges and requirements for participants.