Have you ever done a workout that doesn’t feel particularly difficult but for some reason you can’t stop sweating? Or, on the reverse, your muscles feel sore AF, but you haven’t sweat a single drop?

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Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. Sweat isn’t an ...

The average man lugs around about 44 liters of water—nearly 100 pounds worth—tucked away inside his cells and filling the gaps between them, or coursing through his blood vessels. The average woman, ...