It’s the physical manifestation thing. It also helps you try to be more mindful of your feelings. For instance, if you normally feel anxiety in your jaw, and you find your jaw tightening again in whatever situation you find yourself in, you might see if you can slow down and think of your next steps. Why am I feeling anxious? Should I take a break?

This only really made sense to me for the emotions that I strongly felt physically, like anxiety so bad I would get tunnel vision. For smaller physical reactions, not so much.