Notice how much of the tightness in you is the verdict you are passing. As the judging comes down, the body tends to come down with it.

What the research says

In an analysis within a trial of mindfulness-based cognitive therapy, the capacity to stand back from your own thinking rose in the people doing that practice and not in those taking medication. That is one specific skill, measured during recovery from depression, and it is not a study of anger or of blame. What it does suggest is that this stepping back is trainable and that it came from doing the practice.

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