You probably have a clear idea of the shape and position of your spine, but are you right?
I wasn’t. I thought my vertebrae were the knobbly bits I could feel, just beneath my skin on my back.

In fact those bones are long pointy processes that stop the spine bending or twisting too far. The weight bearing vertebrae are much nearer the middle of my body.

I also hadn’t realised that the natural curves of the spine take it even deeper into the centre of my body. Learning this has changed my posture and I can stand for long periods without getting tired.