Anything that doesn't kill you brings you closer to death in some way if it is hurtful.

Uhhh exercise can be hurtful (muscle soreness) and I'm sure we can find other examples

Not that I disagree with the rest of your post. I love a good sauna, but the joy of it is that it ends when I get out (and maybe jump into a pile of snow). A heat wave is just... Taxing