No, not exercise. It was just refreshing in august. Then for some time there was no reason to stop. Like "it's one degree less than last week. Why should I stop now?". At some point I just wanted to know if I could keep on doing it throughout the winter. When it was 4° I wasn't in the water for longer than 30 seconds. Just a few swim strokes, a dunk the head and out again. And it feels really good right after. A little bit like right after sauna.