Allow Group Exercises Classes to start at the same time gyms are opened

Group exercise instructors are a "little forgotten group" of self employed workers. A lot of us have not been eligible for the self employments grants or if we have, have not received enough money to stay afloat. In the previous Tier 3, gyms were allowed to be open but group exercise classes were not allowed which meant we have been out of work for a lot longer than most. It is just as safe for a group exercise class as the gym floor providing Covid regulations are adhered to.