From Official Website of 2018 Asian Games: Swimming has individuals and teams games. Swimming is one of the most popular Olympic sports. The athletes compete to be the fastest in the 50-meter pool. There are 19 numbers that are contested for men and women. Swimming contested since I New Delhi Asian Games 1951. Japan is the most dominant country in swimming. Since New Delhi 1951 to Incheon 2014, Japan has collected 258 gold medals.
Swimming: is based on speed in water, there are deferent events like freestyle, breaststroke, backstroke, and butterfly.
The freestyle races are 50, 100, 200, 400, 800, 1500 and 10 000 meters. The 1500 meters is only for men and the 800 meters is only for women. The breaststroke and the backstroke are 100and 200 meters events the 200 and 400 meters have all four strokes (backstroke, breaststroke, butterfly, and freestyle).
The race is completed by 4 x 100-meter freestyle, 4 x 200-meter freestyle and 4 x 100meter medley relays.
The qualifiers of the preliminary heat in the 50, 100 and 200 meters move to the semi-finals and finals. In the relay and individual events of 400m and above, the eight fastest finishers move directly to the finals, and all the decisions are based on the fastest times.