Longitudinal relationships among early adolescent physical exercise, internalizing symptoms, and learning engagement: exploring within-person dynamics and the role of gender differences. - Wei, Bohang; Jiang, Wenyuan; Liu, Jianfeng; Wu, Jingtao; Xu, Chunmeng; Guo, Yujiang; Xie, Mingjun (Child & Adolescent Psychiatry & Mental Health, 2025)