I've been in a dry sauna as the temperature gradually reached its max peak of 105 C. At that temperature, the trick is to not move so that there's a relatively static layer of air around you. You also have to breathe slowly so as not to burn your nostrils/throat. And you perspire like crazy and the evaporation of your perspiration cools your body. It's still crazy hot though and you can't last very long before having to exit.

The GP means internal temperature. 41°C would be a ridiculously (fatally?) high fever.

BTW, as a teen I remember playing out in the sun at a good 52°C. Don't think I died :)

Your core temperature doesn't reach 110' F, that's how you don't die.