Yes, standing in front of a counter or your walker. I balance on one foot, bending the other heel towards my butt. Of course my right leg has excellent balance, I could stand there indefinitely. The left is more trouble but I can balance if I put my hands out as if I were on a tight rope. It's a little painful, pain goes right through the knee joint, and I'm a little wobbly but I am able to balance for 10-15 seconds. I only do this twice during each exercise session. I'm also holding on to my walker/counter and raising up on tip toes to exercise my calves, slowly lowering under control keeping legs straight. 1 set of 10 reps, 2x a day. I have a couple of other standing exercises too.
I had new balls on my walker when I got home from the hospital. Walking on the wood floors wore off all the tennis ball fuzz and I was scraping the rubber part so it was dragging a bit. New tennis balls and now the balls skim across the wood floors with ease. You might need some strong scissors to but the slits in the balls bigger as mine wouldn't fit on my walker legs at first. Hubby helped me. My dog got the old balls and was very happy! (until we had to take them away because she was ripping them more)