Decathlon is a combined track and field event consisting of ten events that test athletes' speed, strength, and endurance over two days. For men, day one includes the 100m, long jump, shot put, high jump, and 400m, while day two comprises the 110m hurdles, discus, pole vault, javelin, and 1500m. Women's events are similarly split over two days but in a different order. World champions in individual decathlon events include Hicham El Guerrouj of Morocco in the 1500m and Yelena Isinbayeva of Russia in pole vault. Several world records in decathlon events are held by athletes such as Usain Bolt