Based on self-determination theory (SDT), social cognitive theory (SCT), and planned behavior theory (TPB), this study systematically investigates the key influencing factors of psychological intervention for adolescent physical exercise. This study involved 1200 adolescents from six middle schools in three provinces: Jiangsu, Hubei, and Sichuan. The age distribution of these students was 12-18 years old, with M=15.3 ± 1.7 years old. Small scale empirical tests have shown that with changes in psychological intervention factors for physical exercise, the weekly exercise frequency increased from 1.12 ± 0.35 times to 2.97 ± 0.42 times, the duration of each exercise session increased from 38.6 ± 12.3 minutes to 65.8 ± 15.6 minutes, and the exercise intensity increased from 2.3 ± 0.6 minutes to 3.7 ± 0.8 minutes. The psychological indicators of adolescents also showed significant improvement, such as a 39.9% increase in initiative indicators, a 40.7% increase in self-efficacy indicators, a 39.3% increase in social support indicators, and a 44.7% increase in sports identity indicators. This model provides an effective analytical method for psychological intervention in adolescent physical exercise.
