Athletes may not have to wear a mask if it would cause a medical condition or exacerbate an existing one, such as trouble breathing. The AAP says masks may be removed when participating in certain activities, such as:
Water sports like swimming and diving, since wet facemasks are more difficult to breathe through. For the same reason, masks that become soaked with sweat should be changed right away.
Sports in which facemasks could pose a safety risk, like gymnastics, cheerleading, tumbling, and wrestling. In these sports, there is a chance the facemask could get caught on equipment and create a choking hazard, or accidentally cover eyes and block vision.
Some outdoor sports, such as golf and singles tennis, as long as the athletes can keep a safe physical distance from others.