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Improve the cold tolerance and immunity by going to sauna during cold days.
Embrace the cold and don't overheat yourself by wearing too many layers.
When go cycling or running don't wear to many clothes, so you won't overheat yourself. You should feel slight cold and the exercise will heat you.
People usually catch flu due to low immunity or overheating and switching between environments of high temperature difference.
I think that flu thing is an old wives tale. You usually get flu because you breathed it in. The association with cold is because during cold weather people spend more time in poorly ventilated areas.
I don't quite understand. Aren't saunas hot, and would increase temperature differences?
The environments which are meant are those where you are switching between above average warmy office/room and outside.
When people heat their room/office to 25+ Celsius, spend entire days there drying out mucosal and are surprised that they caught flu.
Drinking water helps in that situatio , but its temporary solution. Its better to not overheat yourself.
My experience with exerting in the winter is I start feeling hot around the neck and upper torso first. So if I'm wearing a thermal jacket below a windbreaker, I'll start with leaving the thermal zipper down a bit but have the windbreaker's up all the way.
Problem is, some take way longer to heat up from exercise.
I will usually not reach a comfortable warm until 1-2 hours in doing regular walking (and no, I will not do a 250m sprint to finally feel warm).
For everything else: Agreed. For cycling in the cold I recommend biking gloves. Game changer!