Indoor high-intensity/ mask-off sports/ exercise activities. Gyms and fitness studios may conduct indoor mask-off sports/ exercise activities in group sizes of up to 5 persons, similar to indoor mask-on and outdoor activities. Sports and exercise classes can continue in groups of no more than 5 persons, in classes of up to 50 persons including the instructor, or the capacity limit of the venue, whichever is lower. SportSG will release more details on this.