Swimming at the 1968 Summer Olympics – Women's 400 metre freestyle Swimming at the 1968 Summer Olympics – Women's 400 metre freestyle The women's 400 metre freestyle event at the 1968 Olympic Games took place between 19 and 20 October. This swimming event used freestyle swimming, which means that the method of the stroke is not regulated (unlike backstroke, breaststroke, and butterfly events). Nearly all swimmers use the front crawl or a variant of that stroke. Because an Olympic-size swimming pool is 50 metres long, this race consisted of eight lengths of the pool. Heat 1 Heat 2 Heat 3 Heat 4 Heat 5 Heat 6 Key: OR = Olympic record
Swimming pool water sports, physical therapy as well as for the training of lifeguards and astronauts. Swimming pools may be heated or unheated. The "Great Bath" at the site of Mohenjo-Daro in modern-day Pakistan was most likely the first swimming pool, dug during the 3rd millennium BC. This pool is , is lined with bricks, and was covered with a tar-based sealant. Ancient Greeks and Romans built artificial pools for athletic training in the palaestras, for nautical games and for military exercises. Roman emperors had private swimming pools in which fish were also kept, hence one of the Latin words for a