I went into a lane a few down from hers and asked the guy there and he said sure. He was the only one in the group who was a good swimmer, and we didn't have any trouble sharing for the short time I was in there. Then someone left a lane and I grabbed that one.
My arms don't feel it this time. Same number of lengths, resting in between, as last week. Interesting. Maybe my form is improving a little, and maybe the little time I spent with weights during the week helped too. Now I want to dig out the coaching book on swimming I have. A book, yes. Better than nothing. I want help with breathing mainly right now.