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I wonder if it's because coaches in the term I've heard this the most (European football) aren't responsible for general player improvement but hold more of a GM role making decisions on tactics, man management etc.
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I’ve heard “those who can’t teach” originally referred to injury and old age, not lack of talent or skill. Granted that was from a teacher.
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Interesting absence of punctuations in the 1st strment. Personally, it would improve considerably if you wrote ‘those who can, “do” those who can’t teach’.
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