Gym belt is a REALLY bad idea
In really cold water you can become unconscious from hypothermia surprisingly quickly so the suggestion of treading water would become drowning if you couldn't get to shore VERY quickly. The idea of using such a belt is false security and therefore foolish and dangerous.
Frankly, even a good PFD may not save you from "freezing to death" in cold water but it should keep you from drowning so you have a little longer to be rescued.
I'd happily pay real good money for a device I could count on rather than a 50 cent yard sale item that fails when you really need it. Personally, I'd be really appalled to give such a suggestion and then found someone got killed following it.
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