Background: Modelling academic self-concept through second-order factors or bifactor structures is an important issue with substantive and practical implications; besides, the bifactor model has not been analysed with a Chinese sample and cross-cultural studies in the academic self-concept are scarce. Likewise, latent structure validity evidence…

Introduction: According to Self-Determination Theory, it is known that motivation is an essential factor for the adherence and enjoyment of exercise, generating long-lasting habits. The importance of generating such habits from an early age is a determining factor in the future health of people. The child and youth population invests a great…