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To Stacifitness, Good question. I looked for that answer too and found a nice calculation in Paula Radcliffe's book 'How to run' It' your weight in kilograms by 0.033. So I for example am 62.1kg so that is 62.1x0.033=2 litres of water per day, plus in general extra one litre for every hour you run ( or work out I would…
