Just hit OoT and read a book or watch tv, occasionally looking up to make sure you haven't run out of map and then do it over again.

Skill check every time you hit water, even if you are not swimming. Currently have swimming around 70's/lvl max'd?I think from fighting in shallow water bith in the swamp and GuK

xp in Everfrost, you get swimming skill ups on ICE

As with many things in life, the real skill is in the entry/exit method.

Oh man, I forgot about that. Lol.

Circle swimming has been decent skillups from what I've seen

Swimming seems to be weird at times, even with the ancient and powerful circle trick, it will barely go up. Other times I fall in the water and on my way out I gain 7 skill ups.

What I do is the circle thing, see if I get skill ups, if not I get out and try again. Probably all bullshit but it makes me feel like it is working.

Yes. The game checks for a swimming event more often when you change directions. I mean I have no fucking idea, but I swam a dozen times from the end of oasis to the northern ro and then I went swimming in a circle in Neriak in front of the PoD and the difference wasn't just noticeable, it was amazing.

In Kunark, I definitely got skill ups swimming against a wall in crushbone. I specifically remember doing this as no one wanted to group with my halfling warrior and I had nothing else to do.