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→Race Mistake 7 - Not making allowances for heat/humidity
''Main articles: [[Impact of Heat on Marathon Performance]], [[Heat limited running pace]], and [[Optimum Running Temperature]]''
Heat and humidity has a huge impact on race performance especially at the marathon distance. If a race is hot, all or hot and humid, then you will not be able to perform as well as you would in the cold. The ideal race temperature for the majority of people is about 40f/4c. Failure to allow for the heat stress will mean a catastrophic slow down later in the race, and can result in heat related illnesses. Wearing dark clothes can make the heat far worse, so wear white.
==Race Mistake 8 - Racing with injuries==