Comment by greendestiny_re

If you're feeling depressed, you might be helped by a—warm bath.

A 2017 Freiburg study [1] took 36 moderately clinically depressed patients and assigned 17 to 30-minute, 40 °C hyperthermic baths, with 19 as control.

After bathing twice a week for four weeks, the study claims the 17 patients had a "moderate but significant improvement".

[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5371197/