I took recycling out on the way to PT. The therapist was pleased with two of the exercises (I'd added reps myself) and made one more difficult, but the balance one was still off. So I got three more:
1. Feet exactly together, arms crossed over chest, eyes closed. Try not to fall (do in front of wall).
2. Heel-toe back and forth, do in hallway in case of wobbling.
3. Walk sideways on the treadmill as slow as it will go. I had to lean way forward to step up, but that turned out okay and then I faced to the left and side-stepped for a minute. I was frazzled after that and I realized it was because I was too far from the side handle that I needed to hang on to -- I was leaning over while I did it. So I moved as close as I could (occasionally putting a toe on the non-moving part) and that worked better, but it was my right shoulder that hurt, not the legs or balance. Clearly, I can't do this at home.
I felt fine when I left there, but am slightly sore here at home. I may need a nap.