Background/objective: Exercise-related cognitive errors (ECEs) is a significant factor that can influence regular physical activity among emerging adults. Findings of previous studies suggested that mindfulness interventions can improve the level of regular physical activity (PA) levels. However, the potential mechanisms of how mindfulness is related to PA levels are still relatively unknown. Thus, this study investigated the potential association between trait mindfulness and PA and determined whether trait self-control and exercise-related cognitive errors serve as mediators. Method: In total, 328 Chinese participants (61.3% female, Mean age=20.65, SD=2.21) completed a series of questionnaires, including demographics, the Five Dimension Mindfulness Questionnaire short form (FFMQ-SF), the Exercise Cognitive Bias Questionnaire (E-CEQ), the Brief Self Control Scale (BSCS), and the International Physical Activity Questionnaire short form (IPAQ-SF). A structural equation model was used to investigate the potential relationships between trait mindfulness and PA levels, with trait self-control and exercise-related cognitive errors as mediating variables. Results: Trait mindfulness, trait self-control, and ECEs were significantly correlated with PA. Further, trait self-control and exercise-related cognitive errors mediated the relationship between trait mindfulness and PA. Conclusions: This study provides evidence that trait self-control and ECEs are likely to mediate the relationship between trait mindfulness and PA levels, providing a new direction for further research aiming to reduce ECEs and improve PA among emerging adults.