I’d say over the last few years, maybe a pandemic coping mechanism cum wellness industry explosion, I have gotten into plunging into cold water during the winter months. I have never done an ice bath, but rather enjoy sitting in the bay or ocean for brief stints. I find it to be nature’s version of Ctrl-Alt-Delete. A system reboot. The water in Penobscot Bay in the summer does not ever get really warm. Even in August here it was quite cold. Every morning, sun piercing the horizon, I would do a few cycles in the bay to start the day. Up and at ‘em.