| I believe good coach CAN make a difference to a sportsperson, and sometimes just a change of coach. A new coach can sometimes spot something a previous one had not. Also coaches, like athletes have strong and weak point to their technique that can suit different people.
To refer to the case in point- if I'm not mistaken I think I saw the comment being made - The athlete in question was a British sprinter (can't recall her name) who had always done ok in major championships but often faded at the end and failed to make finals. On this occasion she won her semi final with a strong mental performance after a change in coach. In this case it looks like the coach helped her with the mental side of the sport and therefore (for me) clearly did help.
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The more I practice, the luckier I seem to get.
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