During a sports training session, is it advisable to wear a face mask to protect oneself from COVID-19?
Physical activity in training involves an increase in respiratory function, so it is not advisable to wear a mask, which may instead reduce respiratory capacity, and also become too moist from sweat, losing its function, as well as becoming an easy target for microorganisms.

Asthma and weather: how to reduce discomfort
Temperature too high or too low, excessive humidity or
Dry wind, thunderstorms, chemicals and allergens in the air we breathe
act variably on the mucous membranes lining the respiratory tract.