Iain Montgomery talks with Glenn Auerbach about why sauna, bathing and cold-water culture has suddenly gone mainstream in cities around the world, and why the reasons go far beyond health trends or wellness hype.

From floating saunas and mobile heat rooms to dawn swims in urban rivers and harbours, we explore how shared rituals of heat, cold and recovery are reintroducing forms of social connection that cities have quietly lost.

Glenn traces sauna’s roots as everyday civic infrastructure rather than luxury amenity, reflects on the risks of gatekeeping and elitism as the scene grows, and explains why inclusive, well-held sauna culture can strengthen community, public trust and even environmental stewardship.

The conversation reframes sauna not as a fad, but as a clue to how cities might better balance pressure, release, togetherness and solitude.

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