I hired the personal trainer too. I just kept thinking I was doing something wrong and I should just follow his schedule. So I did exactly what he said, and that did not work either. I even did worse on the stamina test after training with him for a while than on the test at the start. That is when I quit.

Ihave tried bicycling and I had similar issues with that. But maybe I did not keep enough to my own pace. That was back when I did not understand how it worked and just tried a schedule to build up stamina. You are exactly right, it should not be about performance. Maybe I should try it again with my new mindset. Thanks!

Swimming does work if I go slow! So, I am in the lane with the elderly and just go slowly back and forth. The physiotherapist did tell me I should not go into water that is too cold, because my stress might increase from that as well. So, I found somewhere to swim when the water is warm. I try to do it once a week.