Fig. 1

Correlation analysis between diversity of sports participation and physical fitness in different age groups. 50-meter run and endurance run are low superiority indicators, others are high superiority indicators; Body Muscle Strength (BMS): incline pull-ups for boys 8–12 years old, pull-ups for 13–18 years old, and sit-ups for girls 8–18 years old; Endurance run: 50-meter x 8 round-trip run for 8–12 years old, and 1,000-meter run for boys and 800-meter run for girls 13–18 years old.