At the World Swimming Championships and Summer Olympics in the Games program includes 5 relay types: 4 * 100 meters(freestyle,men and women),4 * 200 meters(freestyle,men and women)Combined 4 * 100 meters(in each event a different style,men and women);Mixed 4 * 100 meters(freestyle,men + women),Mixed Combined 4 * 100 meters(in each event a different style,men and women).