Sentō
In the 20th century, sentō became less popular.  To keep customers, sentō owners put in bubblers, exercise equipment, saunas, electric shocks and other things bathers could not get at home.  In 1972, there were about 21,200 sentō in Japan.  This went down to 13,250 in 1985. There were 499 sentō in Tokyo as of 2021.