Answer:
Psychoneuromuscular theory is an idea that can be used in order to improve your performance if you are an elite athlete, but also for average people can have very positive effects since it provides a better concentration level, helps when coping with pain and improves your abilities to solve problems.
It basically works on the premise that the brain imagines in a way that is so real by using as many senses as possible that the result of innervation in muscles is the same as if the action were being performed.