Swimming (sport)

Swimming is an individual or team racing sport that requires the use of one's entire body to move through water. The sport takes place in pools or open water. Competitive swimming is one of the most popular Olympic sports, with varied distance events in butterfly, backstroke, breaststroke, freestyle, and individual medley. In addition to these individual events, four swimmers can take part in either a freestyle or medley relay. A medley relay consists of four swimmers who will each swim a different stroke, ordered as backstroke, breaststroke, butterfly and freestyle.
Swimming each stroke requires a set of specific techniques; in competition, there are distinct regulations concerning the acceptable form for each individual stroke. There are also regulations on what types of swimsuits, caps, jewelry and injury tape that are allowed at competitions. There are many health benefits to swimming, but it is possible for competitive swimmers to incur injuries such as tendinopathy in the shoulders or knees.

History

Evidence of recreational swimming in prehistoric times has been found, with the earliest evidence dating to Stone Age paintings from around 10,000 years ago. Written references date from 2000 BC, with some of the earliest references to swimming including the Iliad, the Odyssey, the Bible, Beowulf, the Quran and others. In 1538, Nikolaus Wynmann, a Swiss–German professor of languages, wrote the earliest known complete book about swimming, Colymbetes, sive de arte natandi dialogus et festivus et iucundus lectu.
Swimming emerged as a competitive recreational activity in the 1830s in England. In 1828, the first indoor swimming pool, St George's Baths was opened to the public. By 1837, the National Swimming Society was holding regular swimming competitions in six artificial swimming pools, built around London. The recreational activity grew in popularity and by 1880, when the first national governing body, the Amateur Swimming Association was formed, there were already over 300 regional clubs in operation across the country.
File:Burgess and Webb.jpg|thumb|left|The routes taken by Webb and T.W. Burgess across the English Channel, in 1875 and 1911, respectively.
In 1844 two Native American participants at a swimming competition in London introduced the front crawl to a European audience. Sir John Arthur Trudgen picked up the hand-over stroke from some South American natives and successfully debuted the new stroke in 1873, winning a local competition in England. His stroke is still regarded as the most powerful to use today.
Captain Matthew Webb was the first man to swim the English Channel, in 1875. Using the breaststroke technique, he swam the channel in 21 hours and 45 minutes. His feat was not replicated or surpassed for the next 36 years, until T.W. Burgess made the crossing in 1911.
Other European countries also established swimming federations; Germany in 1882, France in 1890 and Hungary in 1896. The first European amateur swimming competitions were in 1889 in Vienna. The world's first women's swimming championship was held in Scotland in 1892.
Men's swimming became part of the first modern Olympic Games in 1896 in Athens. In 1902, the Australian Richmond Cavill introduced freestyle to the Western world. In 1908, the world swimming association, Fédération Internationale de Natation, was formed. Women's swimming was introduced into the Olympics in 1912; the first international swim meet for women outside the Olympics was the 1922 Women's Olympiad. Butterfly was developed in the 1930s and was at first a variant of breaststroke, until it was accepted as a separate style in 1952. FINA renamed itself World Aquatics in December 2022.

Competitive swimming

Competitive swimming became popular in the 19th century. The goal of high level competitive swimming is to break personal or world records while beating competitors in any given event. Swimming in competition should create the least resistance in order to obtain maximum speed. However, some professional swimmers who do not hold a national or world ranking are considered the best in regard to their technical skills. Typically, an athlete goes through a cycle of training in which the body is overloaded with work in the beginning and middle segments of the cycle, and then the workload is decreased in the final stage as the swimmer approaches competition.
The practice of reducing exercise in the days just before an important competition is called tapering. Tapering is used to give the swimmer's body some rest without stopping exercise completely. A final stage is often referred to as "shave and taper": the swimmer shaves off all exposed hair for the sake of reducing drag and having a sleeker and more hydrodynamic feel in the water. Additionally, the "shave and taper" method refers to the removal of the top layer of "dead skin", which exposes the newer and richer skin underneath. This also helps to "shave" off mere milliseconds on your time.
Swimming is an event at the Summer Olympic Games, where male and female athletes compete in 16 of the recognized events each. Olympic events are held in a 50-meter pool, called a long course pool.
There are forty officially recognized individual swimming events in the pool; however the International Olympic Committee only recognizes 32 of them. The international governing body for competitive swimming is World Aquatics, which was known until 2023 as the Fédération Internationale de Natation, or FINA.

Open water

In open water swimming, where the events are swum in a body of open water, there are also 5 km, 10 km and 25 km events for men and women. However, only the 10 km event is included in the Olympic schedule, again for both men and women. Pool and open-water competitions are typically separate events, except at the World Championships and the Olympics.

Swim styles

In competitive swimming, four major styles have been established. These have been relatively stable over the last 30 to 40 years with minor improvements. They are:

In competition, only one of these styles may be used except in the case of the individual medley, or IM, which consists of all four. In this latter event, swimmers swim equal distances of butterfly, then backstroke, breaststroke, and finally, freestyle. In Olympic competition, this event is swum in two distances: 200 and 400 meters. Some short course competitions also include the 100-yard or 100-meter IM – particularly, for younger or newer swimmers involved in club swimming, or masters swimming.

Dolphin kick

Since the 1990s, the most drastic change in swimming has been the addition of the underwater dolphin kick. This is used to maximize the speed at the start and after the turns in all styles. David Berkoff became the first to use it successfully; at the 1988 Olympics, he swam most of the 100 m backstroke race underwater and broke the world record in the distance during the preliminaries. Another swimmer to use the technique was Denis Pankratov at the 1996 Olympics in Atlanta, where he completed almost half of the 100 m butterfly underwater to win the gold medal.
The dolphin kick was rarely used in freestyle sprint races until 2008, when "technical" swimsuits were introduced to the sport at the European Short Course Championships in Rijeka, Croatia. Technical-suited Amaury Leveaux set world records of 44.94 seconds in the 100 m freestyle, 20.48 seconds in the 50 m freestyle and 22.18 in the 50 m butterfly, spending more than half of each race submerged, more than any of his competitors.
Subsequently, FINA made a rule that swimmers may not go farther than 15 metres underwater. In 2014, FINA rules that a single dolphin kick may be added to the breaststroke pullout before the first breaststroke kick.
In the past decade, American competitive swimmers have made the most use of the underwater dolphin kick, notably Olympic and World medal winners Michael Phelps and Ryan Lochte.

Competition pools

pools must be long and wide, with ten lanes labelled zero to nine ; the lanes must be at least wide. They will be equipped with starting blocks at both ends of the pool and most will have Automatic Officiating Equipment, including touch pads to record times and sensors to ensure the legality of relay takeovers. The pool must have a minimum depth of two metres.
Other pools which host events under World Aquatics regulations are required to meet some but not all of these requirements. Many of these pools have eight, or even six, instead of ten lanes and some will be long, making them Short course. World records that are set in short course pools are kept separate from those set in long course pools because it may be an advantage or disadvantage to swimmers to have more or less turns in a race.
Due to waves created by the swimmers, it can be an advantage to swim closer to the center of the pool during a race. Due to this, World Aquatics regulations specify which lane each swimmer competes in based on previous times.
In a ten lane pool this is as follows:

Lane	Time
1	7
2	5
3	3
4	1
5	2
6	4
7	6
8	8

Seasons

Competitive swimming, from the club through to international level, tends to have an autumn and winter season competing in short course pools and a spring and summer season competing in long course pools and in open water.
In international competition and in club swimming in Europe, the short course season lasts from September to December, and the long course season from January to August with open water in the summer months. These regulations are slowly being brought to competition in North America.
As of right now, in club, school, and college swimming in the United States and Canada, the short course season is much longer, from September to March. The long-course season takes place in 50-meter pools and lasts from April to the end of August with open water in the summer months.
In club swimming in Australasia, the short course season lasts from April to September, and the long course season from October to March with open water in the summer months.
Outside the United States, meters is the standard in both short and long course swimming, with the same distances swum in all events. In the American short course season, the 500-yard, 1000 yard, and 1650-yard freestyle events are swum as a yard is much shorter than a meter, while during the American long course season the 400 meter, 800 meter, and 1500-meter freestyle events are swum instead.
Beginning each swimming season racing in short course allows for shorter distance races for novice swimmers. For example, in the short course season if a swimmer wanted to compete in a stroke they had just learned, a 25-yard/meter race is available to them, opposed to the long course season when they would need to be able to swim at least 50 meters of that new stroke in order to compete.