You've been to Japanese public baths? me too! How was your experience?@masrika
I went a few times when I was out there - all bar one were really small ones (single baths, noone else there, maybe one other person at most) and those were just like excessively relaxing fancy baths (especially in Nikko, which was up like around cloud level, and in a volcanic area, so loads of minerals and stuff.
The really public public one was in Tokyo, and it was heaving. It was incredibly relaxing, hopping from bath-type to bath-type. The sauna was great but a little too stuffy for me, but it had a TV which was interesting. The outside baths were great to cool off after the sauna.
The best bit was the electric bath. It had a seat-shape in the floor of the bath, and in the arm bits of the seat were two metal panels with electricity running from one to the other. When you sat down, it immediately made your muscles in between the arm rests tense up - so your butt and legs would tense, and if you lowered your arms into the water, they’d lift up. It was weird, but left me really relaxed afterwards, muscles all destressed out and everything. Plus I got chatting to a lovely old Japanese man sitting next to me - he found my reaction highly entertaining!