Trait personality has been associated with achievement and many of its related outcomes in settings such as education, health, physical activity and sport. Scant trait personality research has been performed among school-age students in physical education, so this study investigates relations between the six-dimension (HEXACO) model of trait personality and anxiety, self-efficacy and intentions to exercise as a function of gender in 316 high school physical education students. Students completed validated measures of these constructs. Results revealed that trait personality (particularly the social self-esteem aspect of extraversion) predicted lower anxiety and higher self-efficacy and intentions to exercise in both females and males. Openness to experience was predictive of both anxiety and lowered self-efficacy in females. It appears that physical educators should consider the role of the HEXACO personality traits and sub-traits in their students and potentially differentiate instruction to better accommodate students who are more vulnerable. From this study, it appears that students who are less extraverted and females who are more open to experience may be at be more at risk for anxiety and lower self-efficacy in physical education which may compromise their intentions to exercise.