In 1980, tests of world class Russian athletes showed that mental training was far more productive of improvement than physical training! Electrophysiological testing had indicated the dramatic value of mental imaging as early as 1932.
Hypnosis cannot make unskilled people into champions, but it can generate performance at or near "personal best" levels.
Hypnosis to improve athletic performance deals with four categories: goal setting, relaxation, concentration and rehearsal. Goals need to be written down; relaxation relieves tension; concentration removes distractions; mental rehearsing has proved more productive than physical practice. Olympic athletes use it often, with superb results. Mental processes do not remove the need for physical training and practice, but can maximize productive results.