Exercise should always end up being a daily (or close to daily) activity. It becomes difficult, though, when we are not up to par. Feeling down in the dumps makes it harder to motivate ourselves to be active. However, exercising while you are sick could actually improve your condition. How can we tell when it is healthy to get some exercise while feeling sick, and when we should probably rest?
Usually, we can go by something called the “neck rule.” If the symptoms of your illness are exclusively above the neck, then working out will more than likely help you to feel better. A mild routine will improve circulation to help get rid of that lethargic feeling. On the other hand, if your symptoms are below the neck, rest is more than likely a better choice. If you are running a fever, exercising should always be put off, no matter what your symptoms are. Just remember, it is your body and always your decision on what you should do with it.
Read more at prevention.com