The structural integrity depends on the strength of your foundation.
Your body’s postural integrity depends on the strength and alignment of your feet (then knees, & hips )
The thoracolumbar fascia is a very important tissue of the body as it is needed for coordinated movement, plus it is an attachment site and a connective element for a number of muscles and joints of the lower and upper back. This being said, it is not uncommon for pain to occur in the middle or lower back regions stemming from thoracolumbar fascia injury.
If your work requires long periods of sitting, put an emphasis daily on mobilization therapy.