Published Wednesday, July 7, 2021 4:06PM EDT Last Updated Wednesday, July 7, 2021 4:06PM EDT An Ontario gym operating using a physical therapy exemption has been ordered to shut down after being linked to a COVID-19 outbreak that could force as many as 400 people to self-isolate. Halton Region Public Health said it is aware of 15 cases of the highly transmissible Delta variant of COVID-19 linked to the Muscle HQ gym in Oakville, Ont. Gyms across Ontario cannot currently offer indoor services due to public health restrictions, but Muscle HQ had been operating by allowing members with doctors' notes that cite the need for physical therapy to train.