When standing or sitting, why is it nearly impossible for us to remain completely still if we try?

Question

When we try to be completely still, we either have a little twitch or our head sways and we just can’t keep still, even if we put our minds to it?

In: Biology

Answer 1

This has to do with muscle tone (not the thing you do with weights). Muscle tone refers to the continuous contractions of muscles. Basically your muscles are never completely at rest. They are always active and contracting to some degree. This helps to maintain posture and to regulate other bodily functions.
This is involuntary, so we can’t stop these “micro-contractions” from happening.