i do sauna and cryo 3-4 times a week. sauna is great for detoxing but i would argue wear sweats while you work out for a similar benefit. in health the biggest cause of aging is inflammation. the longevity community calls it inflammaging. anything you can do to reduce inflammation has a slew of cascading physiological benefits. while both sauna and cold plunges are hormetic stress and good for health, i think the benefit of inflammation reduction from a cold plunge sets it apart. as well, it is mentally hard af to wholly submerge in 50° water. that rewires your neurochemistry for longer term preference naturally. this is why i would go cold plunge hands down.