I take a mild bleach bath sometimes and it’s quite invigorating. Seems to kill off a lot of skin surface bacteria which can sometimes be beneficial (there’s good and bad bacteria on your skin).

Not to be done too often but every once in a while I find it helpful. Not all that different from a strongly chlorinated pool.

Another cool one, especially if you don’t have a sauna, is doing a mustard bath. You will sweat like a stuck pig