OK-so I did 800 yards. And it was time to get out. Legs shaking. But no shoulder pain! And the breathing was better than I had thought it would be. I did 4x 200, mixing it up, and not using any equipment (fins, pull buoys, or paddles). In the middle I did 6 x 50 on 1:00. I made the intervals. Will get back in maybe Friday early AM, but will limit the distance to 800. Looking forward to it, actually!