hmm, so i suppose it's like the swimming pool and gym, the heat in the room helps you in the effort.
as for sauna, there's a way of breathing you must learn, it's hard to explain but once you're in you adapt yourself to the heat. and usually there's a bucket filled with water and eucalyptus, so you just have to put some on the hot stones and the eucalyptus in it will help you breathe
