I think that's great for you. Truly.

Could it be that your experience doesn't apply to everyone?

I've been living in the same area as you, and I go for walks almost daily; it's astonishingly miserable out.

I have a friend who does almost identical physical activity to me, as we have similar jobs. He sweats very little when outside unless physically exerting himself. I sweat profusely when just walking; even when wearing significantly less clothing.