Research on the physical fitness changes of adolescents aged 13-15

By comparing and analyzing the statistical data of adolescents aged 13-15 selected from the three National Physical Fitness Monitoring Bulletins over the past decade, this study examines the physical fitness changes of adolescents in this age group from three main aspects: physical form, physical function, and physical quality. The results show that over the past 10 years, there has been a significant improvement in the physical form development of Chinese adolescents aged 13-15, with all related indicators showing marked increases. In terms of physical function development, there have also been improvements to varying degrees, especially in lung capacity, which has seen a substantial increase. Regarding physical quality, boys have shown improvement in speed quality, while girls have outperformed boys in the other three aspects of physical quality, with boys experiencing varying degrees of decline in these areas.