You're a bit lucky because the back is very likely to have pain in sedentary office workers. I think the standing and running are both key, yes, movement and change are key to keeping our fluidic bodies healthy.

Then again, you are lucky because all manner of injuries, genetic weakness, and former life conditions have not all occurred, thus gotten you to this healthy spot. For instance, car or sporting accidents or falls, these could all lead to chronic weakness in the body, and luck determines their occurence.