I like to wait until I'm on the mend.
I don't mind going out for a walk in a beach or a nice trail when I'm still very sick, but not any real exercise.
When I'm through the worst of it jogging or something like that seems to makes me get back to normal quicker.
I think working out and continuing your normal routine as best as possible kicks the nest of energy production going and flowing.
I also do other two things that seem to have very great result that normally wouldn't be considered "the chicken noddle soup approach". I make sure to eat my regular diet / schedule (but the healthiest most energy giving items known) to the point of near puking if needed. And if I have a fever I put a beanie on. It takes the headache away and probably lowers the fever.
The reason I believe that works, is because your body is intentionally trying to raise the temperature of the mind. If you put a beanie on or blanket, you make it easier to do that so it tries less harder.
It's like that of the sweat reaction. If you're outside in the heat, your body sweats with a lot of effort to cool itself down. But if you're in the cold and exert a lot of effort, it won't even bother sweating.
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