Well, if your joints hurt and you have no energy at all, then of course exercising doesn’t make sense and you should just rest. But if you still have some energy, you can still exercise but decrease the intensity and time that you exercise. For example if you usually run on the treadmill for 30 min, run at a slower rate than your normal and do it for only 15–20 min. The key point is to not overexert yourself since that will make the cold worse. But moderate and little exercise cannot hurt. Just stay away from contact sports (swimming etc) because you don’t want to pass on the cold. Sports med doctors feel that if your symptoms are “above the neck and you have no fever” then you should be fine with exercising. Also, maybe instead of doing your normal workout routine, you could just do simple household chores such as vacuuming? This will serve as a dual purpose, clean house and you will get the little exercise needed. Just make sure you don’t overdo anything and as soon as you start feeling tired, you should stop. Here are two links that support my link1 and link2 Hope you get well soon and remember to keep drinking fluids :)