Kneipp Treatment, Germany
19th century Bavarian priest Sebastian Kneipp is considered one of the founders of naturopathic medicine including a form of hydrotherapy that uses hot and cold water to treat an array of ailments.
Kneipp treatments are thought to strengthen immunity and boost circulation, thereby refreshing dull complexions and giving the practitioner a robust sense of good health.
Icy arm bath, anyone? Danke, Deutschland!