I sympathize with all of you struggling to walk or exercise with pain. When I was recovering from on of my hip replacements, had very limited mobility, and needed to move regularly to prevent blood clots, I did what my in-laws used to do when housebound by extreme cold or icy conditions in northern Minnesota - house walking. Every hour I would get up and walk around my house - into and through each room, out again, onto the next... and keep it up for 5 minutes. When my Mom was recuperating from one of her strokes, we did a modified version - hall walking. Using her walker, she would walk as far down the apartment hall as possible, with me following pushing her wheelchair, rest a minute in the chair, then walk home. She progressed over time to walking laps of the hall, and later laps around her building outdoors.
Maybe a version of house walking (or yard walking) several times a day could work for you?
Sue