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| not to get too hot sitting on it and then falling in because there is a small risk that the temperature change can cause shock. | |
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Remove the word "small". There is a risk full stop. The bigger the temp difference the bigger the risk.
It is called cold shock and sends the body, including breathing, into spasms.
Dont need to elaborate here on the consequences in water. All the other advice above is pretty sound. I will be doing it in a kayak this summer.