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SWEAT-BASED therapies have been around for hundreds of years: The ancient Greeks and Egyptians loved to heat up in bathhouses; temazcal lodges were an integral part of indigenous communities in Mesoamerica; and in Finland, sauna-ing (the word “sauna” derives from the Finns) so pervades the culture that this nation of 5.5 million people harbors more than 3 million saunas.
Infrared sauna therapy, which involves exposing the body to radiant energy, emerged in mid-20th century Japan where doctors pioneered its use in the belief…