Yesterday was my first day in the pool. After 15 minutes, I was noodle-legged and out of breath. But happy - I easily swam through two cycles of 2 laps then 12 breaths rest. The next two cycles of the same were tougher, but I got it done. This is better than I expected. And today I feel my muscles, but I am not sore.
Two thumbs up for the summer workout! I will happily substitute this for running, as long as the weather stays in the 80's-100's.