Swam for the first time in two weeks last Tuesday. My back didn't hurt during the swim, and a new swim coach was giving me pointers. He's very good - gives you one thing to concentrate on, lets you swim for awhile with that, asks how's it going, and, if you're comfortable with that, gives you another thing to work on. I got about 4 things to work on during that workout.
I'm not too certain about some of the similes that they use, though - am I pulling myself through the water, or pushing myself through the water? Either I'm pulling on a rope or pushing up a ladder - maybe I'm pulling myself up a rope ladder.
There is a "fingertip drag" drill swimmers do to work on form - you drag your fingertips across the water at the end of the stroke to ensure you are recovering properly. It's amazing how solid the water feels as you pull* your hand along the surface.... I am constantly amazed by that fact, since you can't walk on water**.
............
Update - in spite of a wonderful swim on Tuesday, I couldn't get anything together on Thursday. Not certain the issues there - I had an awful swim, my back started hurting and I left early. Couldn't get into any rhythm whatsoever. Since it is now a three-day weekend, and I'm recovering from some sort of stomach bug, I'll skip the swim on Tuesday and catch up on Thursday....
*or push?
** at least, I can't walk on water. I do have experience with some people who feel they possess that attribute.....