Swimming is an individual or team sport and activity. Competitive swimming is one of the most popular Olympic sports, with events in Butterfly (is a swimming stroke swum on the breast, with both arms moving symmetrically, accompanied by the butterfly kick). Backstroke(style has the advantage of easy breathing, but the disadvantage of swimmers not being able to see where they are going), Breaststroke(is a swimming style in which the swimmer is on his or her chest and the torso does not rotate.), Freestyle, and individual medley. In addition to these individual events, Olympic swimmers also take part in relays. Men's swimming became part of the first modern Olympic Games in 1896 in Athens. Women's swimming was introduced into the Olympics in 1912.