Sleep 3.0 · Chapter 2 · 1 min read
The banana
What happens to the spine on a surface that is too soft or too firm.
On a surface that is too soft, the heaviest part of you sinks and the spine bends like a banana. On one that is too firm, shoulder and hip are pushed up and the waist hangs.
The aim of a zoned build is a spine that rests in its natural line, on your side and on your back.