Thomson Reuters A new report has linked an outbreak of coronavirus in South Korea to a dance fitness workshop. Fitness instructors had attended a workshop in February where at least 8 participants were infected but didn't show symptoms. By March, those instructors were linked to at least 112 cases of coronavirus in dance fitness classes at 12 different fitness facilities in the region. Experts say that group fitness classes with a large number of people exercising intensely in a small space could increase risk of infection.