I will have to dig up, working out while sick articles, if I can find them. There was a few studies that said, if you have a light cold then working out, can actually speed up the recovery time. If you have a severe cold or flu, the kind that every part of your body hurts, then DO NOT workout. If its just a light head cold, or on that lines, and you are still able to eat some food, you should be able to workout, of course you will have to back it down a bit. but it might help.