Ultra Running also known as ultramarathon is any race longer than the marathon distance (42.195km) and can run on athletics tracks, roads, dirt tracks or open terrains. These races are competed over two different types of race modalities including a fixed distance (like 50km, 100km, etc.) or a set time (like 6hr, 24hr or multi-day races). The sport can be traced back to two-million years when the Homo species evolved and started exploring. Today thousands of runners compete in several ultra-running events around the world.
The IAAF recognizes the International Association of Ultrarunners (IAU) as the global governing body of the sport.
Ultra running races take place on roads, tracks or trails. Some races also take place on a combination of more than one terrain and may consist of few stages or check-points. The race courses may include single or multiple loops on tracks or point-to-point road or trail courses having severe obstacles like rugged terrain, paved roads and inclement weather. These courses usually have aid stations in every 20-35km apart where athletes can take a short break or replenish food and drink supplies. Time-based events are usually organized on a track or a short road course of one mile or less.