Our expert says:
I think it is unlikely to have been the rain or slow running speed - it is more likely to have been hypoglycemia (low blood sugar) or something similar. Make sure that you eat well the day before a race of 21.1km or longer and ensure that you either have about 500ml sportsdrink about 2hrs before race, or a light, high carbohydrate breakfast. Also give me an idea of what you were drinking during the race, because you could have under or overhydrated.
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