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Resistance swimming can be done either against a stream of water set in motion by a usually self-contained mechanical device often termed a swimming machine or by holding the swimmer stationary by means of elastic attachments. Swimming is primarily an aerobic exercise due to the relatively long exercise time, requiring a constant oxygen supply to the muscles, except for short sprints where the muscles work anaerobically.

As with most aerobic exercise it is believed to reduce the harmful effects of stress. While aerobic exercises usually burn fat and help with losing weight, this effect is limited in swimming, even though being in cold water burns more food energy to maintain body temperature.

The reason that swimming does not significantly reduce weight is still poorly understood, but seems to be related to the better heat conduction of water. A number of reasons are suspected.

Swimming exercises almost all muscles in the body. Usually, the arms and upper body are exercised more than the legs.

petitive swimming, excessive leg muscles can be seen as a disadvantage as they consume more oxygen, which would be needed for the muscles in the arms, although this depends on the swimming style. While breaststroke generates significant movement with the legs, front crawl propels the body mainly with the arms.

Sometimes the swimming consists of swimming laps using a conventional stroke, such as the front crawl; other forms can include different forms of exercise performed in the water, such as water aerobics. Swimming may be good for asthma sufferers.

Swimming uses all three energy production systems, which are the creatine phosphate system, anaerobic fermentation also known as Lactic acid buildup system, and the aerobic system. These three systems produce energy in form of ATP to enable muscle use among other body functions.

Swimming is generally a healthy activity and enjoys a low risk of pared with many other sports. Nevertheless there are some health risks with swimming, including the following: Children are often given formal swimming lessons, which serve to develop swimming technique and confidence.

Children generally do not swim independently until 4 years of age.[1] In Sweden, Denmark and in Finland the curriculum for the fifth grade states that all children should learn how to swim as well as how to handle emergencies near water, with the exact definition varying from school to school. monly, children are expected to be able to swim 200 metres 220 yards – of which at least 50 metres 55 yards on their back – after first falling into deep water and getting their head under water.

Even though about 95 percent of Swedish school children know how to swim, drowning remains the third mon cause of death among children.[2] In the Netherlands swimming lessons under school time schoolzwemmen, school swimming are stimulated by the government. Most schools provide swimming lessons.

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