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Re:Those Who Can Do, Can’t Teach by andrewwharton on Sunday August 26, 2018 @07:10AM (#17845366)
The title is a play on the old saying "Those who can't do, teach".

Whether this is actually the case or not is debatable.

Re:Those Who Can Do, Can’t Teach by bostik on Sunday August 26, 2018 @07:53AM (#17845514)
Back in junior high one of the classes was marooned into doing a skit on a school event day. The punchline of the skit was an extended version of the saying - "Those who can, do. Those who can't, teach. Those who can't teach, teach PE. And those who fail at that, end up as head masters."

The head master at the time was an ex-PE teacher.