Aside from people not being able to swim and the cold (which will kill you – potentially quite quickly depending on water temp), unless the water is perfectly still, floating *isn’t* that easy.
I enjoy floating in a local lake. The waves often crash over my head and drag me down a little, at which I’ll have to force my way into a position where I can clear my nose + mouth and get back to floating. It’s not *exausting*, but I also couldn’t do that for more than a few hours at a time. (Which would be enough to get to shore, but not enough to survive indefinitely.)
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