A. This is my simple suggestion. Before the competition starts, meditate most soulfully for five minutes. Try to make yourself feel that you are not the competitor, but that somebody else is running, jumping or playing in and through you. You are only the witness, the spectator. Since somebody else is competing, you are at perfect liberty to watch and enjoy.
But before you start, if you can convince yourself that you are a divine observer and that somebody else is competing in you, through you and for you, then fear, doubt, frustration, anxiety and other negative forces will not be able to assail your mind.
Once these thoughts occupy the mind, they try to enter into the vital and then into the physical. Once they enter into the physical, they create tension, and this makes you lose all your power of concentration. But if you feel that you are not the competitor, then there will be no tension. This is the only way to overcome these forces and maintain the highest type of concentration from the beginning to the end.