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It’s It's harder to run in hotter weatherthe heat, something that is easy to forget when toeing the line at a marathon. If you’ve you've set goals based on cool weather training or performance without taking the heat into account, you will go out too fast and your overall time will suffer. But how much does your performance change with temperature? I found You can't run as fast in the heat as the cool, but if you have a better idea what pace to set, you may be able to avoid a catastrophic result. There is good scientific evidence that [[Running in the Heat]] will slow you down, and there is a study<ref name="study"/> that gives some answersquantifies the slowdown.

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