Exercising in hot weather puts extra stress on your body. If you don't take care when exercising inthe heat, you risk serious illness. Both the exercise itself and the air temperature and humidity can increase your core body temperature.To help cool itself, your body sends more blood tocirculate through your skin. This leaves less blood for your muscles, which in turn increases yourheart rate. If the humidity also is high, your body faces added stress because sweat doesn't readilyevaporate from your skin. That pushes your body temperature even higher.==舒適應該是比較好的 太熱太冷都會給身體增加許多風險不是很好的能納入運動的處方這篇的study我覺得特別有意義
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