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Organized sport participation plays particularly big role in promoting adolescents’ physical activity and health-related fitness. However, it remains to be understood how current, past, or complete non-participation in organized sports affect adolescents’ individual trajectories of cardiorespiratory and muscular fitness and whether adolescents benefit from their past participation in organized sports in terms of fitness. Thus, the aim of this research was to study the development of cardiorespiratory and muscular fitness during adolescence in those 1) who continued or started organized sport participation, 2) who dropped out, and 3) who never participated or dropped out before adolescence.

In this five-year longitudinal study, which was carried out between 2017-2021, self-reported sport participation data were collected annually, and cardiorespiratory and muscular …