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Low-moderate physical activity can still be recommended. However, extreme physical activity and hyperventilation during the incubation days and early stages of COVID-19, facilitates early direct penetration of high numbers of virus particles in the lower airways and the alveoli, without impacting on the airway's mucosae covered by neutralizing antibodies. This allows the virus bypassing the efficient immune barrier of the upper airways mucosa in already infected, young and otherwise healthy athletes. In conclusion, whether the virus or