And in office jobs your core and your back are taking a beating too.

Top spine problem is disc degenerative disease. That's primarily caused by being overweight and out of shape, not lifting heavy stuff repetitively.

Top 10 jobs that cause back pain:

1. Drivers
2. Construction workers
3. Nurses & Healthcare Providers
4. Office Workers
5. Manual laborers
6. Dentists & Dental Hygienists
7. Warehouse & Distribution Workers
8. Auto mechanics
9. Factory workers
10. Baby Care

As you can see, the list is fairly well split between physical and non physical jobs. And only 3 possibly involve repetitively lifting heavy things.

Your argument here doesn't hold water, no matter how many times you try to tweak it.

https://www.shantispinesurgery.com/top-jobs-that-cause-back-pain/