-17?!?!? okay, you get an extra man-card today....
Brr! Not exactly toasty this morning.Not sure how trail runners in Siberia deal with this or worse. Assuming there are Siberian trail runners.
It really isn't much different than 0 degrees. You have to just bundle up and cover your face.
Is it even safe to breathe cold air like that? One time I ran when it was 7 degrees. I lasted ~15 minutes then thought maybe my lungs were going to ice over.
Ya, it's quite safe. It takes about 20:00 of constant exposure at -17 (0mph wind) to cause frostbite and your bronchi are neither exposed to air that cold nor for more than a second or so. There is such a thing as cold air induced asthma when your airways constrict. Dress correctly and it doesn't feel any different than 0 degrees or even +20 degrees.
And I know those numbers because before I headed out this morning I looked it up!
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