it depends. for example, naismith was just a regular citizen that was asked to come up with an indoor sport for winter. so it could be an inventor,scientist, retired sports player, or just an average joe.
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Well, when the first child who threw, say, a mammoth tooth at his father, and his father smacked it aside with, say, his stone headed spear, repeat, and Bam! a sport that resembles Baseball. Sports have been around ever since man has had time to do them, so, of course, because history doesn't go back that far, no one can answer that question. Sorry.