Sauna is one of the most discussed interventions which could strengthen our immune systems. Dr. Marc Cohen, who is a medical doctor and a professor of health sciences, believes that sauna and heat-stress could potentially help prevent and even treat COVID-19. He adds that saunas remain an integral part of a healthy lifestyle that includes exercise, smart eating, and sleeping habits combined with social interaction.

https://www.spabusiness.com/spa-business-magazine/Can-saunas-help-combat-coronavirus-safely-and-effectively/34517

Kelo wood is nature's very own antique ~ Sauna from Finland