When I was healthier, I was a spa denizen. So now that my prospects of going to one are practically nil, I'm doing some research into some of the services at home, especially the body temperature things. I used to do a circuit... sauna, cold shower, hot tub, cold swim, sauna, cold shower... repeat until bored.. take a hot shower, wash chlorine off, get dressed, have a gourmet dinner, go home, get a seriously awesome night's sleep. Most spa's have a daily rate which is around $100, so this wasn't a huge expenditure if I did it once every two months. But I admit I often got a massage too, so that made it around $200, plus the cost of dinner.
I think I mourn the loss of that only slightly less than the loss of being able to go hiking.
I'm careful not to overreach financially now that I"m not able to earn much, so I"m thinking of installing something like this in one of the powder rooms in my house and using it as a FIR Sauna:
https://www.herschel-infrared.com/product-range/herschel-select/ I think I'll have to remove the fixtures or I'll get fungus overgrowth, but it might work out to a few hundred dollars that way, and not several thousand.
I have definitely used a traditional sauna to wonderful effect when I was strong enough to go out to one. It often "reset" my sense of stress and helped me recover from a slide into fatigue. Sometimes I think we build our houses wrong. How hard is it to build one of these into every house? Some years ago, you could find apartments and homes, even hotel rooms, with built in heat lamps. Standalone houses had "whole house fans" installed so you could vent the house and in 15 minutes you had fresh air in. Now they're gone. We're devolving into a less civilized state.