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When wanting to know whether it is safe to engage in physical activity when your sick, Jillian Michaels says follow the above/below-the-neck rule.  If your symptoms are above the neck like a runny nose, sneezing or sore throat, then you are safe to engage in low-intensity activity.

If your symptoms are below the neck, like diarrhea, intense coughing, vomiting, or fever, then the Centers for Disease Control and Prevention suggest letting the sickness run its course before engaging in physical activity.

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