Water is a fundamental necessity for human life. The non-fat components of the human body are 70% water by weight. A person can live for a couple of weeks without food, but only a couple of days without water. How much water should we be drinking for optimum health? You will hear that the ideal amount is 8 glasses a day. However, that is something of an urban myth. There has been no clear finding recommending to drink 8 glasses a day. A much better general guide is to drink whenever you are thirsty.
However, when you are training thirst is not a good enough indicator. You can be dehydrating without feeling thirsty. If you are training hard blasting your muscles, especially if it is hot out, you will be loosing a lot of water to sweat. In hard training it is a good idea to drink a glass of water every 15 minutes or so, without relying on feeling thirst. Just stop a few seconds and gulp a glass of water every quarter hour.
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