Well, I don't know if I'd really call it swimming.  On some days, "bathing" would be more accurate.  Nevertheless, I could probably count the number of tripping days I HAVEN'T been fully-immersed/submerged on half the fingers on one hand [and, no, I neither tip over in my canoe all that much, nor do I have several extra fingers!].

Every trip, every day, May through October, I'll spend time in bathing trunks over my ears in water.  I think it creates the illusion in my mind that I am getting myself clean.  It doesn't seem to matter to me if there is cold rain pouring down or what.  Heck, often the shallows near camp are WARMER than the cold rain pouring down overhead.

For me, the swimming/bathing is a camp ritual... kind of like coffee in the morning.  Half the time I do it just to get the OTHER slobs in my camp to consider cleaning up.....

Jimbo   8-)