The sauna at 24 Hour Fitness, in the city of Millbrae, in the state of California, is a basic amenity within a larger gym facility that offers separate men's and women's dry saunas. The facility has ongoing maintenance and cleanliness issues with the sauna areas, including dirty floors and humidity control problems. While the sauna is functional and accessible to members, frequent complaints about hygiene and upkeep suggest it may not meet expectations for those specifically seeking a premium sauna experience.