At first glance, the scene can be surprising: people in swimsuits emerging from a steaming cedar sauna and heading toward the cold waters of Lake Washington. Heat up. Cool down. Repeat. That’s the simple rhythm behind Bywater Sauna’s newest location at Leschi Marina, and for many participants, the appeal becomes obvious after the first session. Barrel Sauna exterior. “I feel more connected to nature, more part of the Seattle ecosystem,” says Natalie G. “It’s magical to be swimming with rain...