Here is my rule for working out when sick (that has been supported by my doctor):
If you have only symptoms ABOVE the neck, like headache, runny/stuffy nose, earache, etc, it is OK to work out, within your body's limits. If you start feeling exhausted/dizzy, your body is telling you to stop.
If you have ANY symptoms BELOW the neck, like exhaustion, fever, body ache, or chest cough, workouts should be skipped or at least extremely scaled back (replacing an intense workout on the elliptical with a walk around the block) until you're feeling better. Pushing yourself when you have below-neck symptoms is probably just going to increase your total recovery time, making you sicker longer, meaning your workout schedule will be further delayed.
Your body, by making you dizzy and exhausted, is telling you to stop pushing so hard. Please listen.
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