Fluid replacement position paper

Courtesy of the american college of sports medicine. They also have a consumers guide to fluid replacement that is less rigorous and panders suitably to commercial interests.

They suggest daily weights after arising and voiding, with comparison weights after exercise to calculate actual fluid loss, which seems to vary from not much to 8 liters for a 300 pound lineman in full pads. A liter of water weighs one kilogram, or a pints a pound.
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