The rationality of swimming technique plays a key role in the swimming speed of athletes. Reasonable technology should be able to minimize resistance and increase driving force. The resistance of swimmers in water includes active resistance and passive resistance. Passive resistance is mainly related to the athlete's body shape and posture in water, while active resistance is related to the athlete's swimming style in water. If the athlete's body center of gravity moves smoothly when swimming in the water, and the change of swimming speed is relatively uniform and stable, the athlete's active resistance will be relatively large during swimming; On the contrary, the active resistance will be small.

With the increase of weight and the changes of other physical conditions, his skills have also changed. Stroke frequency and stroke amplitude are the main factors that determine swimming speed. According to the relationship between speed and stroke frequency and stroke amplitude, if the stroke amplitude is the same within the same distance, the stroke frequency is high and the stroke speed is fast; If the stroke amplitude is different and the stroke frequency is the same, the stroke amplitude is large and the speed is fast. The length of stroke range is closely related to stroke strength, stroke speed, technical mastery, height and arm length.

The main theoretical basis of the theory of large-scale exercise training is that sports performance is based on good endurance, and the view that endurance is faster is put forward. Sports physiology theory points out that aerobic metabolism is the basis of anaerobic metabolism, and high-level anaerobic metabolism is based on high-level aerobic capacity. This provides a theoretical basis for the theory of large amount of exercise training. With the deepening understanding of the essence of swimming, it is gradually found that it is not good to simply emphasize large amount of exercise or exercise intensity. It is necessary to reasonably combine exercise intensity and exercise amount according to the specific situation and training objectives of athletes.

To achieve coordinated efforts, on the one hand, it is necessary to increase athletes' coordinated exercises on land, such as using various mats, ball games and unarmed exercises to improve athletes' physical coordination and control ability; On the other hand, it is to improve the ability of athletes to control their bodies in the water, so that the strength of their bodies can be transferred to their arms and legs through the rolling of their bodies during swimming. Swimming separately, swimming together and kicking exercises can be used to train athletes' body control ability, coordination of exertion and the ability to keep their movements relaxed.