I don't think I've ever been in a cold pool before, they are usually pretty warm. Indoor ones are usually heated, and outdoor ones usually get plenty of sun.
Lake Michigan takes me a long time to acclimate to, though. That water is almost never warm. Rivers are always ice cold, too. I think the worst part is when you finally start to warm up, and then you have to go home...so you're walking back to the car with an ice cold shirt clinging to you, and a nice cool breeze blowing on you...brr....
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