LINCOLN, Calif.--(BUSINESS WIRE)--Plunge, the leading cold plunge company, today announced the launch of its latest product, The Plunge Sauna. Introducing an entirely new category of heat therapy to the product lineup, The Sauna is designed to elevate wellness experiences through heat exposure, and is the perfect addition to any state-of-the-art home, gym, or spa. The new offering serves as a complementary tool alongside Plunge’s s…