FWIW, if it’s not a musculoskeletal injury/concern (and their possible neuropathic symptoms), maybe focusing on core & lower back strength at a gentle but regular pace could hero you like it has for me. My spine’s survived 3 rollovers/tumbling crashes, ~10 auto collisions (7 while I was parked/stopped!), a 90ft cliff jump (never again), and teen years @ a McDojo. I’ve run for improvement, certainly, but the 237lbs I was at a couple years ago is now down to ~170lbs, and I more often feel 20 again —until I look at the world around me, ofc. Then, I’m old AF & tired of fighting the Sisyphean battles toward common decency and compassionate “civilization”. 😅😶