Hypnosis for improvement in a sport,
… The results indicated that all five participants increased both their mean basketball three-point shooting performance and their mean flow scores from baseline to intervention. There were no overlapping data points between the baseline and intervention for either performance or flow state. Additionally, each participant indicated that they had felt the intervention was useful in keeping them confident, relaxed, and calm. These results support the hypothesis that a hypnosis intervention can improve three-point shooting performance in basketball players and increase feelings and cognitions that are associated with flow.
Pates, J., Cummings, A., Maynard, I. (2002). The Effects of Hypnosis on Flow States and Three-Point Shooting Performance in Basketball Players. Sport Psychologist, Vol 16(1), 34-47