Why does America swim so strongly?

Americans' physical fitness is very good in Europe and America, which has a lot to do with their living habits. Most people like sports and do physical exercise, especially on Long Island, the coast of the United States. Many people like swimming, and they all start swimming at an early age. It is much better to train young players than our country, that is, most of the outstanding players of our national team in China come from the coastal areas, especially Jiangsu, Zhejiang and Fujian, which are richer than inland areas. This is the so-called mass base.