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In the vast majority of cases, people don't need salt when they exercise. You just described a fringe case that virtually no one experiences. You high school football coach shouldn't be giving you salt. That could be dangerous. They should be giving you water.
The coach won't be giving them salt directly, but will always provide a sports drink which contains salts.
Ever watch any sport and a player falls over with a cramp? They have drunk too much water and not enough electrolytes.
Here's a study from one hospital in Oslo, Norway. Norway is not considered a hot region of the world. Between 2010 and 2015 they treated 31,000 patients in the ER from a population of 135,000 for electrolyte imbalance. That's roughly 18 patients a day. This is not some sort of fringe case.