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Today I did 8km in a temperature of -17C and apart from the frozen eyelashes and hair it felt fine. Obviously it is harder on the heart and lungs so was probably around 30 secs slower per km than in say 5C but I didn't feel breathing unpleasant. So I am wondering how much colder I could stand - what is the lowest temperatures others have run in? I really hate the treadmill so want to avoid it all costs.