Is there any truth to the idea that you can sweat a cold out of your system?
While your body can't literally sweat out germs or toxins, in some cases exercise can be good for fighting a virus, says Dr. Tyler Cymet, who practices osteopathic medicine at Sinai Hospital.
If you have a basic upper respiratory virus and are in good shape, doing something active may be beneficial.
By raising the temperature of the body (which often drops slightly with a virus), working out can help your system fight the bug, Cymet says.
If your illness is more serious, however, exercising will stress the immune system. it.