When you are sick your body is in an inflammatory state and is working hard to heal your body. Exercise also creates inflammation which is a good thing, that’s how your body adapts to make you faster, stronger and fitter but it can also add to the already inflammatory state you are in. Also a hard work-out can redirect energy and nutrients away from healing to help recover from the exercise.
Some gentle exercise is ok if you are sick but I would say go easy on the harder workouts
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