Same to me, but I was more active when I was living in a warm country. Now I am living in a mildly cold winter country, and struggling to go out out to walk/run because of the cold. 3 weeks and I already feeling less productive and healthy.
I haven't tried the breathing masks though I probably should since I have asthma and breathing in the cold makes it worse.
What about breathing? Do you use any mask or this is something that you get used too?
I do the same, body is used to idle in the winter/cold time. In summer, I spend almost all my free time outside.
Feeling great at my 40's.