Water itself doesn’t provide energy, but it plays a big part in various body processes. Dehydration makes you feel more fatigued, but water also helps transport various things around the body (not only nutrients but also waste products), plays a part in various biochemical reactions.
The body is like 60% water. This isn’t just sloshing around by itself, it’s mixed with various other critical stuff your body needs like electrolytes that are critical in muscle movement, it affects blood volume, and it plays a very important part in regulating body temperature. Sweat is mostly water and is the main way you stay cool. Not replacing these lost fluids has a big impact in performance.
Think of it like the oil in an engine. It doesn’t provide any energy by itself, but it critical for the engine to actually function.
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