The present study examined the effectiveness of a mental skills training (MST) package employing relaxation, imagery, goal setting, and self-talk (strategies for improving performance and perceptions through cognitive-somatic techniques) on equestrian performance. A stratified random sample of 17 competitive collegiate horseback riders participated in this study: 8 received MST and 9 were controls. Riders’ goal orientation was also assessed and used to determine if there might be a relationship with performance change over time. Assessment of participants via performance in 2 horse shows revealed no interaction effect for group by time in either flat or show-jumping performance, but there was a significant main effect of time for performance improvement. Riders demonstrated a dominant mastery-approach goal orientation as hypothesized, but no significant correlations with performance change emerged. Findings do not rule out MST as a possible performance enhancing technique, but more research is needed to assess nomothetic MST package effects.