You need to find out what works best for you.
The drinking until your urine is clear for three days may work fine for some people, but can actually cause severe problems with others.
Overdrinking can lower blood sodium even before the race begins.
Your hydration should be designed to minimize loss of body weight so you avoid dehydration during exercise but prevent weight gain from excess hydration during training or races.
Lots of great resourses about this on the web. See SMP's post about this on the Women's issues board.
search word: "Hyponatremia".
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