The construct of mindfulness appears to be compatible with theories of flow and peak performance in sport. The present study assessed how Mindful Sport Performance Enhancement (MSPE), a new 4-week program, affected flow states, performance, and psychological characteristics of 11 archers and 21 golfers from the community. Participants completed trait measures of anxiety, perfectionism, thought disruption, confidence, mindfulness, and flow. They additionally provided data on their performances and state levels of mindfulness and flow. Analyses revealed that some significant changes in dimensions of the trait variables occurred during the training. Levels of state flow attained by the athletes also increased between the first and final sessions. The findings suggest that MSPE is a promising intervention to enhance flow, mindfulness, and aspects of sport confidence. An expanded workshop to allot more time for mindfulness practice is recommended for future studies.