Your posture isn’t broken. Your capacity is.
The usual story blames “bad posture” for desk-related shoulder pain. But the research doesn’t back a reliable link between how you sit and whether your shoulder hurts. The real issue is capacity: your shoulder and upper back don’t have the strength and endurance to comfortably hold up to a full day of desk work.
Why it happens
- The upper traps overwork holding your arms at a keyboard and mouse for hours
- The scapular stabilisers (lower traps, serratus) switch off in a sustained forward position
- The mid-back stiffens in prolonged flexion, forcing the shoulder to compensate
- The rotator cuff fatigues picking up the slack week after week
What actually helps
Not sitting up straighter, building the system’s capacity and moving more often.
- Thoracic mobility: foam roller extensions and thread-the-needle rotations
- Scapular stability: prone Y-T-W holds and wall slides
- Rotator cuff endurance: light-resistance external rotation for higher reps, a few times a week
- Movement variety: every half hour or so, a quick reset of thoracic extensions, shoulder squeezes and neck retractions
The timeline
Recent symptoms usually ease in 3-4 weeks. If it’s been going on for months, give it 6-8. The point isn’t a perfect posture, it’s a shoulder and upper back robust enough that a normal work day stops being a problem.