|pre-Christmas 2015 run in the dreary dead of winter|
(note trees) -- except it was 71 deg F/ 22 deg C!
But it was nearly that, at 71 degrees F (22 degrees C), record-breaking for Washington, DC (average December 24th temperature is 30 degrees cooler!). Crazy.
Not only that, my little GPS watch showed that my pace was far faster than I'd expected (5:20/km or 8:35/mi in what was supposed to be an easy run), supporting the idea that sweating helps improve athletic performance, on top of keeping you cool in hot weather.
Historically not a major concern in winter, sweating is generally good for us as we exercise.
Sweating is our body's means of staying cool. Eccrine sweat glands, found all over our body, produce clear, odorless fluid that is basically water + salts. As the water evaporates off our skin, we feel cooler (and saltier).