It just happened again. Someone expressing disbelief that exercising can backfire and make things worse. He said he never heard of such a result from exercise. So I asked, if someone is run down with the flu, do you think going out jogging will give them more energy. He agreed that it will probably make things worse. So I said, what about pneumonia, virus infections, colds, etc. They all cause fatigue, so should exercise be the treatment for those? He agreed that exercise could make these worse. I wonder. If people already know that exercise can make things worse, why do they claim they have never heard of such a thing happening. I have a feeling that part of this is the term "Chronic Fatigue." It is as if fatigue is the illness, not a symptom of an illness. But still, to claim that they have never heard of exercise making a condition worse is just plain nuts. Because they all knew that they should cut back and rest when they are ill.