Abstract
INTRODUCTION: The physical fitness of college students is a growing global public health concern. A critical challenge in improving student fitness is addressing the intention-behavior gap-the disconnect between students' intentions to engage in physical activity and their actual behavior. METHODS: This study utilized survey data from TikTok-using college students, incorporating variables such as gender, academic grade, health belief perceptions, and planned behavior perceptions. Multiple machine learning models were developed to predict the presence of the intention-behavior gap. The performance of these models was evaluated, and SHapley Additive exPlanations (SHAP) was applied to the best-performing model to interpret feature importance. RESULTS: Among the models tested, SHAP analysis revealed that perceived barriers were the most influential factor contributing to the intention-behavior gap. Furthermore, the results indicated that male students in higher academic grades, with fewer perceived barriers and stronger subjective norms regarding physical activity, were significantly less likely to exhibit this gap. DISCUSSION: These findings suggest that university health promotion strategies should focus on reducing perceived barriers, cultivating a supportive campus environment for physical activity, and optimizing the allocation of physical education resources. Such measures may effectively support the transformation of students' physical activity intentions into consistent, health-promoting behaviors.