So hot

It is unbearable heat outside and this heat found me even in the gym. This might seem unbelievable.
The gym is equipped with air-conditioning but when you are doing exercises for hours and have to breath strenuously – it is clearly felt, that the throat is aching because of the cold air. Probably something like this is experienced by the people climbing the mountains.
There it I probably even worse, but this training in the gym forced me think – what to do?