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Old 01-24-2013, 05:31 PM   #2
gymrat05
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Join Date: Jun 2011
Posts: 315

S/C/G: 210/185/137

Height: 5'8"

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I've run -10C without the windchill before (I think that's about 15F?). It depends on your tolerance of the cold. I'm from Toronto so running in the 40s for me would mean light pants or crops, a tank and a moisture wicking base-layer. That's the key - especially if you are a heavy sweater. You don't just want to bundle in warmth, you want the clothing to wick away any sweat so you don't feel chilled. The layer against your skin should draw moisture away from your skin. You can get all kinds of moisture wicking base layers at all different price points. I think even Costco has some cheap right now if you need one. And then just layer. The general of thumb is dress 20 degrees warmer than the actual temperature - so if you're running in 40 degree weather, dress as though it were 60 degrees.

In terms of breathing, your respiratory system will be fine in those temperatures. It might feel harder to breath at first but just easy into it. Try and breath through your nose as much as possible (it gives the air more time to warm up in your body before it hits your lungs) and be prepared to go a little slower than you normally would initially as your body adjusts to the cold.

Oh and really take the time to warm up properly. Some people warm up *indoors* (say, run up and down your stairs a few times) before exposing their muscles to the cold.

It really won't feel cold once you start moving and you might enjoy it. I love running when it's cooler out because you don't have to worry about beating the heat!
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