Interesting article. I did know about the salt part, but what I didn't know is that you can flush that salt out completly in such a short period of time as the article mentioned (about 4 hours) if you don't drink huge amounts of water. Then again, the amount of salt you lose also depends on how well trained you are, a trained athlete will lose much more water but also less salt than an amateur.

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You only die once. But it lasts such a long time.-French proverb