Warming to 140 degrees or more in a wood-fired sauna (gotta be wood-fired so you can toss cold water on the rocks that set on the stove to add scorching humidity). Then, sprinting out into the night, and down the beach a until I fall over in Lake Superior works for me. My extended family shares time at my Grandparents place on Lake Superior in Michigan's Keweenaw Peninsula each summer. We occasionally participate in the Finnish tradition of taking a sauna and jumping into the big lake. Always makes me feel alive. For that matter, jumping into the lake daily is close to the same. It takes some overcoming the immediate shock, but spending even five minutes in water that's 50-60 degrees Fahrenheit works for me. While staying by the lake I skip regular showers and soap up in the lake. Definitely dusts the cobwebs off my brain.