Being still is not the problem. The circuit that shuts you down under threat is the same one that lets you sleep deeply, digest, rest and curl up with someone you love.

What the research says

A measure validation study of an interoception scale found that noticing and responding to internal body sensations contributes to overall wellbeing and relates to anxiety, and it built its measure from everyday behaviours rather than laboratory tasks. Being able to notice what your body needs, and answer it, is part of the picture. It is a measure development study, so it describes a relationship rather than showing that practising this changes anything.

Strength of evidence: one line of research. A single study, or a theoretical account.