Otužilci Frýdek≈Místek logoOtužilci Frýdek≈MístekIt is easier than it looks.
Otužilci Frýdek≈Místek together beside the River Ostravice in winter
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Otužilci Frýdek≈Místek logoOtužilci Frýdek≈MístekIt is easier than it looks.
Otužilci Frýdek≈Místek together beside the River Ostravice in winter
Otužilci Frýdek≈Místek

Cold-water swimming together in Frýdek-Místek.

Winter swimming in the Ostravice three times a week, from October to March.

We also meet for runs, hikes and other activities. Friendly people are always welcome — join us.

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Season openings and finales

Our eighth season of swimming together at U Žida starts on Saturday 3 October

Hello, fellow lovers of icy water! At 9 am on Saturday 3 October 2026, we begin our eighth season of cold-water dipping and winter swimming together at U Žida in Frýdek-Místek. Everyone who has shared a winter or two with us is invited — and so is anyone who keeps saying that next year they really will come along. Make this the year!
Otakar Zemek3 min read
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Practical announcements

JSEM TU! is available on Google Play from today

JSEM TU!, the app for cold-water swimmers, has been available to download from Google Play since 4 September 2026. We updated this article on 12 September to reflect the current version. It is in public open testing in Czechia and Slovakia. Accounts can now be created from age 9; anyone under 16 needs a parent or legal guardian's approval before using the app.
Otakar Zemek3 min read
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Cold-water swimming advice and safety

How to get into cold-water swimming — without overcomplicating it

The internet is awash with advice on how to get used to cold water. As so often happens, the first thing you see is a paid course, a “unique method”, cold therapy, biohacking or a workshop where you spend several thousand crowns learning that cold water is cold and that you should breathe properly while you are in it.
Otakar Zemek10 min read
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Cold-water swimming advice and safety

Transcript: Ota Zemek's discussion with AI about cold-water shock

While reviewing the website, AI challenged what I had written about experienced cold-water swimmers jumping into icy water. Rather than letting it rewrite the text automatically, I asked for a single well-documented case, followed by a precise examination of the studies behind its position. The outcome was more than a simple yes or no: it was a much clearer distinction between a measurable bodily response and clinically dangerous cold-water shock.
Otakar Zemek15 min read
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