The evening started by meeting Alex, who picked us up from our accommodation and drove us straight to his sauna by the lake. There was a dressing room inside containing everything we could possibly need. We did three sessions of sauna. When taking a break, we sat on a bench outside, in -14 deg. Celsius. It didn't seem cold at all. Then, after running approx. 10m, we jumped into a hole in a frozen lake. Its hard to describe the feeling but it's definitely experience of a lifetime. A tasty dinner made by Alex & his wife in a building nearby concluded this great evening.
Make sure to dive in the frozen lake. The alternative is jumping into a snow which, somehow counterintuitively, felt much colder!