Stolen from Facebook

Same, though it definitely increases the amount of water you can carry internally and steadies the rate at which water leaves your system. Both can be useful in situations where you need to “camel” water more often.

Also beginner athletes’ ability to maintain electrolyte homeostasis can be erratic, leading to a “better safe than sorry” policy, and of course salt is the easiest way to make new athletes hydrate until they learn to self regulate. That’s all I can think of.