When you are sick, you need to pay careful attention to what your body is telling you. If you have a cold that is primarily in your head, it's okay to exercise, just at a lower intensity (provided you feel okay and have enough energy). Once you are feeling 100% again, then you can slowly increase your activity back to your pre-illness level. If you're feeling sluggish or the workout isn't going well, don't push it. When you push too much, the sickness can end up hanging around longer.
If you have a cold that is below the neck (in your chest), try to refrain from activity until it clears up. The best thing you can do for your body when it's trying to fight a bug is to give it rest.
If you have the flu or something more than a cold, it would probably be better to rest until your body is able to do more.
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