The main area (cardio, wait lifting) of the gym is not airconditioned at all! Centralised ventilation simply sucks in air from the street. When the air temperature outside is above +22 and the area is busy with people working out, it is simply unhealthy to stay there, not even to work out. The gym management just says they can’t do anything about it.
You can see in huge letters IT’S UP TO YOU on one of the walls there. It’s actually up to the weather, if you can have a work out.
How unprofessional is that!
Simply install air conditioning... or warn clients before they sign contracts.