The British still swam with the head above the water, a holdover from the days when people believed that the water was contaminated. An overhand stroke was introduced into England in 1873 by J. Arthur Trudgen, who had seen South American Indians using this method to swim really fast. To swim well u need to know how to coordinate your arms and legs to get you through the water. At first you will probably need to have lessons. Also to swim u need agility and just gravity.
Swimming also requires balance and quickness in some cases.
Not much is needed to know if you want to swim. Swimming improves heart and lung efficiency, enhances muscle strength and endurance, improves flexibility, and reduces stress. It s easy on the joints, and uses more muscles than most other forms of exercise. Although swimming burns a great deal of calories, recreational swimmers tend to lose less weight than would be expected from other types of aerobic activity. Scientists say that cold water removes heat from the body, stimulating appetite to keep the body warm.