On June 29 and 30 it was again possible to work out in the gym. To demonstrate that the inventive system works as intended with the occupation of the athlete, two measurement days have been organized. The ventilation rate was set in accordance with the standard on the first day of measurement. This shows that this is far insufficient for a healthy and safe sports environment. On the second day of measurement, the inventive system is set to the target value and to the existing occupancy. Measurements show that the system responds to the measured value and provides sufficient ventilation air to stay within the desired value, thus ensuring a healthy and safe sports environment.