In addition to Terri’s response I would add that water is essential for repacking glycogen into the skeletal muscles. It takes 3 grams of water to pack 1 gram of glycogen. Glycogen, the storage molecule for glucose, is obviously critical for vigorous and/or sustained exercise. One point to keep in mind is that a muscle only metabolizes fatty acids in the mitochondria if there’s adequate glucose available. If a muscles “runs out” of glycogen further contraction won’t occur. Runners call this “hitting the wall,” cyclists “bonking.”
Another important point is consume water in small amounts (1-2 oz) at a time as this allows the water to move from the digestive tract into the bloodstream, where it’s needed. Drinking large volumes all at once only challenges the kidneys to filter a substantial volume and spill it in the urine.
Terrific Answers. Dont forget that in Hot Climate States with high heat indexes (relative temperature with relation to humidity/ Humidex) and other variables, the avergae 8 on 8oz will not be enough. The setting will regulate the water dosages as well as proper electrolyte ingestion within the hydration process..
I also agree with Danielle and water will also aid with weight loss by speeding up your metabolism. I always stress the importance of water with my clients and I make sure they have water breaks and bring a water bottle of their choice.