a rut. It could be walking around a good size room, or standing and doing some stretching movements with arms, waist, leg movements, etc. I turn on some music or something to listen to while excercising. I am trying to increase my excercise a little at a time. I really got into some bad habits during the pandemic. A couple of weeks ago Saturday I had to take my car to get the battery replaced. It was going to be a couple of hours. I went and took a walk around, and slowly picked up the pace as I got into a rythym. The point is not to compare exactly how much I do to anything else at this point, but just to do a little more when I feel like it. If I feel sore or tired I take it easier for a few days. Maybe some meditation or something that helps me relax. I also have worked on improving my diet. This can be a big help I have found as well. Instead of researching, just do something simple without the research.
I'm not very good at this sort of advice but I felt like giving it a shot. Hope you feel better.
One more thought to add. Breathing deeply while doing any of the above also helps.