Think of your spine as the central pillar of a magnificent building. When it is aligned, it can bear immense weight effortlessly. But when we sit, we allow this pillar to slump and this frame to crumple. Day after day, we are teaching our bodies a new shape: the shape of the chair.
It isn’t one specific posture that is harmful; it’s prolonged stillness in any posture that wears the body down.
This forward head position is often called tech neck. The human head weighs about 10–12 pounds, but tilting it forward 45 degrees to look at a screen raises the load on the neck to about 49 pounds.
The 49-pound figure: Hansraj, Surgical Technology International, 2014