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What is the explanation of the previous sentence of "enhancing people's physical fitness"?

The first sentence to enhance people's physical fitness is to develop sports.

“Civilized spirit, barbaric physique”, “Develop sports, enhance people’s physique”, “Strong sports will make China strong, and national fortunes will make sports prosper.” In the long history of China’s sports development, one by one The loud slogans have evoked infinite pride and inspired the people in different eras. ?

In the journey of the Communist Party of China leading the people to forge ahead, the achievements of sports have been dazzling; on the road to the great rejuvenation of the Chinese nation, the dream of becoming a sports power is being realized. ?

The introduction of physical exercise is as follows:

Reasonable physical exercise can induce adaptive changes in the functions of adolescents’ cardiovascular systems through long-term physiological stimulation. Sinus bradycardia. The reason is that the role of the parasympathetic nerves that control cardiac activity is strengthened, while the role of the sympathetic nerves is weakened. The resting heart rate of teenagers who have been engaged in physical exercise for a long time is significantly lower than that of people of the same age who do not exercise.

Exercise-induced cardiac enlargement. Research has found that exercise training can enlarge the heart of athletes, and different exercise methods have different effects on heart enlargement. Exercise-induced cardiomegaly is a good adaptation to prolonged exercise load.