The Norseman Xtreme Triathlon is an Ironman-length test of endurance that takes place in Norway each year. The race is often referred to as the “toughest tri in the world” and watching the video above its easy t understand why. As with all triathlons, the race begins int he water, but in this case that means starting in the chilly Hardangerfjord Fjord near the town of Eidfjord. After completing that 3.86 km (2.4 mile) swim, its on to the bikes for a 180 km (112 mile) ride that begins with a 40 km (24.8 mile) slog up hill, gaining 1200 meters (3937 ft.) of vert in the process. The final stage is of course the 42.2 km (26.2 mile) marathon leg, which is thankfully most flat. Well, except for the last section which runs up a local mountain called Gaustatoppen to a height of 1880 meters (6167 ft.). As you’ll see in the clip above, none of it is easy, even for a professional triathlete. Applications are now open for the 2020 event.