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cold showers are kinda a meme for the ascetic, but what they actually do, is when you are stressed, and your body gets all inflamed, cold water helps leech that stress out of your body. it's a life giving gift, water. you can achieve this in a shower, but it's better just going to a body of water and doing this, whether sea or lake because it engages all of your senses, being out in nature, and will encompass your whole body. the adrenaline shock from submersing your body alone is enough to release a flood of feel good endorphins. i think it's probably why baptism was a popular religious practice back in biblical times.