Eliana - not to a lot of people, but let me tell you frankly, when I workout, I SWEAT (not just due to effort, though obviously the harder I work the more I sweat, just in general...it happens to most people in my family). Also, some people's sweat is saltier than others, or so I've read. I did mention it to my doc, as I was concerned that it was a sign of dehydration or possibly too-high sodium intake, and he said that it wouldn't be a bad idea to up my salt a bit on days it happened so it wouldn't get too low, but that generally I didn't need to be concerned.
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