Think about sitting in terms of reps.
If you sit one way all day long everyday, that’s THOUSANDS of “reps” you are doing.
Thousands of reinforcements to the nervous and musculoskeletal system to move and stay in this one position.
If we want to maintain health of our muscles and nerves to remain capable and balanced, we need to be moving our respective parts (including the pelvis ) through their FULL range of motion.