Coaching is not a science, it is an art. The key word is balance. You are a bit like a comedian: when the stage opens you have to make people laugh, whatever has happened to you before.
A coach creates emotions, not only transmits notions: and this must be trained, because there is also an emotional intelligence. If you are pessimistic, being a coach is almost impossible. Optimism is needed. Which does not mean that if we do everything well we will win for sure: there is also the other team. It is not enough to do things well, we must do them better than others!
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