The World Health Organisation (WHO) has warned people against wearing masks while exercising, saying masks may reduce the ability to breathe comfortably. WHO gave the warning on Wednesday in an update of its Coronavirus disease (COVID-19) advice for the public: Myth busters. It said that sweat could make the mask become wet more quickly which made it difficult to breathe and would promote the growth of microorganisms. “The important preventive measure during exercise is to...










