Re: Gemorahs. Let only those who read Aramaic and learn b’iyun teitch gemorahs for us. That not only leaves out the ladies, but I suspect a lot of the gentlemen too. The current generation seems to have a lot of book-laden donkeys in it. The best thing to do is – surprise! – ask your rav. He knows you, knows what your halachic and hashkafic boundaries are, and can give you a personalized answer.
As for me, when I exercise, I wear a long, very loose skirt which allows plenty of motion, including high kicks, a loose stretch top with elbow-length sleeves, and a light head scarf. (For some reason I feel really weird without something on my head, even if there’s no one else around.) Swimming in a skirt is, however, not only awkward but dangerous. A regular swimsuit is OK.
That said, to each her own. I wouldn’t argue with anyone wearing pants in private. And a reminder – nobody poskens from the Gemorah, not even real poskim. Better to ask a qualified rav.