My own take on it is "anything with less than 38,5°C fever means I can at least go out for a walk". But in my case, that's more of a survival mechanism, because staying a whole day in a 20sqm one-room apartment drives me crazy even when I'm good health.
Of course, I don't mean strenuous exercise. Just walking and breathing some fresh is already a good thing. (My doc says the same thing, by the way.)
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