The Hidden Physics of Sitting

You were never designed to sit in chairs all day. While we think of sitting as a simple resting position, it actually relies on two specific, pointy bones in your pelvis to support your entire upper body weight.

These bones, known as the ischial tuberosities, are nicknamed sit bones for a reason. Unlike standing, where weight is distributed through your legs, sitting concentrates your gravity on these two small contact points. This posture is a relatively modern invention that forces the human body to remain rigid in ways it never evolved to handle. Understanding this pressure helps explain why your back aches after hours at a desk.