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# Missing [[Caffeine]]
==Race Mistake 1 - Over-hydration==
''Main article: [[Practical Hydration]] and [[The Science Of Hydration 101]]''
Over-hydration is where you drink beyond your thirst, and can lead to a condition called [[Hyponatremia]]. Over-hydration tends to be a problem for the slower marathon runners, typically slower than a four hour finish. Over-hydration will lead to weight gain which will impair performance. However, in rare instances it can become life-threatening and is one of the few things you can do in a marathon race that will kill you. It is vital that you drink to quench your thirst only.