Once upon a time, in the Baseball years of lore, a president was attending a game (can't remember which), in the middle of the seventh inning, he, quite literally, stood to stretch. The other fans, upon seeing the president stand, rose out of respect (respecting a president!!!)...and it has stuck as tradition ever since.
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Playing for a longer period of time, particular when pitching, can potentially do permanent damage to young bodies. It's one thing for 31 year old Sandy Koufax to be unable to throw a ball for the rest of his life, it's another thing for an 18 year old to be in that situation.