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Swimming is a sport which consists of displacement in the water, without touching
the floor.

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Have been discovered paintings swimming of the Stone age, and the first written
references dating 2000 a.c.
Among the Egyptians swimming became one of the key aspects of public
education.
In Japan in the year 38 a.c. Held annually sport competitions and one of them
was swimming.
The Greek to indicate that a person was illiterate, said: "don't know or read or
swim".
But swimming began consider of sport in early nineteenth century in the UK with
the National swimming society of London in 1837.
Tom Morris was the first world champion, to win a career of a mile in the Thames
in 1869.
Swimming is part of the olympic games modern since 1896 in the case of men,
and in the year 1912 for women.
1908 was created the fine: international Federation of swimming.

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Pools competition in world championships must be 50 meters (160 feet) long and
25 meters (82 feet) wide with ten lanes marked from zero to nine (Lane one and
ten in some pools, usually are left empty); lanes must be at least 2,5 meters (8,2
feet) wide. Must be equipped with tacos output in both ends of the pool and most
must have automated equipment, including touch screens to record the times and
sensors to ensure the legality of relay. Pool must have a minimum depth of two
meters.

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In this discipline there are 4 styles:
🏊 Crawl
🏊Breaststroke
🏊Backstroke
🏊 Butterfly
Each style has it is own swimming rules:
Crawl: Will star from the starting bank
🏊 Breaststroke: Will star inside the wáter in style position.
🏊 Backstroke: the arrival touches must be with both hands at the same time.
🏊 Buterfly: The arrival touches must be with both hnads at the same time.

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When swimming is used:
🕳️ Latex cap
🕶️ Goggles
👙 Swimsuit

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wikipedia. (febrero 28,2018). Natacion. marzo 6,2018, de wikipedia Sitio web:
https://es.wikipedia.org/wiki/Natación
FINA. (2015). RULES. marzo 5, 2018, de FINA Sitio web:
http://www.fina.org/content/fina-rules