Back before my knees began to give me trouble, I would switch from running to walking when the temperature hit -22 C. On Thursday morning when it was -26 C, however, I passed a small covey of very hardy joggers--very lean and rather young--as I trudged along wearing my full metal jacket: long johns, running pants, and sweats plus four layers of sweaters and hoodies on top. Good on them, even though the cold air can do real damage to your lungs if you're not careful. That's one of the adaptive...
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