2. The four main swimming strokes, breaststroke, freestyle, butterfly and backstroke, can exercise many muscle groups in the whole body, and these four strokes must exercise the muscles of the arms. Swimming, as an aerobic exercise, can effectively burn fat and achieve the goal of losing weight by maintaining a certain exercise time. There are many advantages to swimming for a long time. Swimming can build a good figure, enhance muscle strength, increase bone mass and exert less pressure on joints, and improve cardiopulmonary function. Therefore, swimming is a very healthy exercise, suitable for most people.