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I have the same symptoms as you; standing still, my lower back starts to ache after 30 minutes or so, but I can walk or run for miles and my back is fine. My h

I have the same symptoms as you; standing still, my lower back starts to ache after 30 minutes or so, but I can walk or run for miles and my back is fine. My hamstrings are very tight from sitting all day, to the point that I cannot even bend 90 degrees at the waist with my back straight without discomfort in my hamstrings. I've assumed that tight hamstrings are the root cause to my back pain while standing, but I haven't fixed it yet. The best results I've had in the past when I was more physically active were from doing "good-morning" exercises. I think it's because you build strength in the stretched position, which is important according to various books I've read like "relax into stretch" and articles on PNF stretching. When I was doing these exercises regularly I was able to put my forhead to my knees without doing any regular stretches.

ksaho 5y ago
I am not sure if this helps, but here may be information about this issue. You can try this out and see if it helps. https://youtu.be/GX7Vz8OWwUI?t=63 https://youtu.be/GX7Vz8OWwUI?t=63 Please at least watch the a minute from the timestamp to see if this can help.
tokamak-teapot 5y ago
Bending forwards ninety degrees with a straight back and legs is something most people can’t do without feeling a strong pull in their hamstrings. I had the same back soreness after starting using a standing desk. I was also running every day and not doing other exercise (thanks lockdown). It didn’t seem to improve over time. When it was allowed, I switched to going to the gym and only doing weights (squats, deadlifts, pull ups). After a couple of months the soreness just vanished, even after standing all day.