Don’t Underestimate the Power of a Walk
Air outside is -40.  Windchill brings that to -57.  My work is shutting down all activities that require being outside for more than a couple minutes.  Forget the health benefits, until it warms up I am not going to walk anywhere other than to my car.  Even that can be dangerous at these temperatures.https://weather.gc.ca/warnings/index_e.html