Swimming after dry fastening

Heyhey, quick question to experienced dry fastest. I'm coming up to the 11 day mark. When the second crisis has passed and all is calm I'm so keen to go swimming in a beautiful cold natural pool up in the mountains, it's been signing to me. Can I have a nice long swim the day I break my fast? I assume my body will just take what it wants and that's that? I'll have broken the fast early am, and swim pm if its not advisable.

Cheers

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