Teens - exercise after vaccine

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I can’t find a clear answer whether teens should avoid exercise after vaccine in order to reduce risk of myocarditis. My son has training for a competitive sport 2-3 times a week. Obviously if he is at all unwell we will avoid, but if he is fine in himself is there still any increased risk? It’s the first dose by the way.

I have suffered myocarditis before and was told not to exercise for 3-4 days after my jab to reduce my risk so I told my sons to do the same, it seemed a sensible thing to do.