I dunno. I never had chronic back or neck pain until I started working office jobs. When I was at university, I spent periods sitting at desks, but was never strapped to one for 8 hour shifts. I would sit down at a desk for max 4 hours at a time apart from during extreme crunch periods, and would spend the rest of my day walking around, lounging and chilling in different positions, excercising, etc. As soon as I started working at an office it became noticably harder to reach an over-10k step count daily, and even though I continued going to the gym and doing heavy back days, my left trap has become completely hardened up, and I've occasionally had lower back pain too during stressful times. I'm totally unable to train upper traps because they are literally like bricks. When I have a weekend where I walk and lounge a lot, or am off sick, or go on holiday, my traps feel significantly better and my workouts are better. It's a lifestyle where you are unnaturally in one position for too long that causes this.