How does posture cause discomfort?
Posture itself is rarely the whole problem. Holding any one position for long enough is, and modern working life is full of them: a laptop below eye level, a chair without back support, a two-hour commute, an evening spent leaning over a phone.
The result is usually familiar. A rounding through the upper back, tightness across the chest and front of the shoulders, a neck that carries the head slightly forward, and lower-back stiffness that arrives late in the day.
