If there's one thing that writers do well, it is sitting. We are experts at it, simply because we get so much practice. We spend most of every day parked on our posteriors. Typically this is combined with a well refined hunch over the keyboard to provide the perfect recipe for a lifetime of tight shoulders and cricked necks.
This is not good. Humans weren't designed to spend most of our time sitting. If we were we wouldn't need expensive chairs with height, tilt and lumbar adjustment – none of which ever seem to be quite right. On top of which we now have those pesky scientists exposing numerous risks to our health from prolonged sitting.
So what to do?