According to the The World Health Organisation, people should not wear masks while exercising as masks may reduce the ability to breath comfortably. Exercising makes you sweat, which can make the mask become wet more quickly. This can make breathing difficult and create room for growth of microorganisms. When exercising, the important preventive measure during COVID-19 outbreak is to maintain physical distance of at least one metre for others. We ask experts for their views on wearing masks while exercising, especially when doing it outdoors.