The basic principle of swimming is buoyancy. The human body has a high water content and its density is close to the density of water. Due to its cavities (most prominently the lungs), the average density of the human body is lower than that of water, so it naturally floats. There are two ways to swim faster:
* increase power
* reduce water resistance
* increase power
* reduce water resistance
Because the power needed to overcome resistance increases with the third power of the velocity the first option is not really effective.
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