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From Fellrnr.com, Running tips
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* '''Don't sweat through.''' If you wear too many clothes and sweat too much, you will sweat through your clothes. Once your clothes are soaked, you will become suddenly chilled. This means you will probably have to dress to be slightly cold, rather than toasty warm.
* '''Windproof layers are a mixed blessing'''. A windproof layer will boost the insulation value of the underlying layers, which can really help keep you warm. Unfortunately a windproof layer also stops sweat evaporating, which regulates your temperature. This makes it much more likely that you will sweat though and become cold. I use a windproof layer, but open it up as soon as I warm up, then try to stay slightly cool. A windproof layer is very useful as an extra layer, as it can be wrapped around your waist easily. I will wear it until I warm up, then carry it in case I need some extra warmth later in the run.
* '''Hydrate.''' Just because it's cold doesn't mean you don't need to drink. Use your thirst as a guide - for more on hydration see [[Practical Hydration]] and [[The Science Of Hydration 101]]
* '''Try to stay dry.''' Rain can chill you very quickly, so in cooler conditions, you need some rain protection. More on this in [[Running in the Rain]].
* '''Your lungs are fine.''' Your lungs will not freeze, not even at -40 degrees. Your lungs may get irritated by the low humidity, but they will get used to that. It is possible to get exercised induced asthma, which is a narrowing of the airways when exercising. If you suspect you have this condition, seek medical advice.