Alternating between hot and cold exposure activates the body’s natural resilience systems. The infrared sauna raises core body temperature, boosts circulation, and supports detoxification. The cold plunge rapidly cools the body, constricts blood vessels, reduces inflammation, and activates the vagus nerve—stimulating a parasympathetic (rest-and-digest) response. Together, they improve circulation, reduce soreness, support immunity, and regulate the nervous system.