r0wly86
Head Pro
For particular activities that require multiple staff in an enclosed space for a prolonged period, my employer has introduced Lateral Flow Testing. It takes less than half an hour and is supposed to be reliable. Would probably be useful for organised sport training and competition, although I have no idea of cost.
It was a one in one out into a large shed outdoors. temperature taken by infrared thermometer, not perfect by any means, but would have kept the transmission down considerably