This beatiful cat feels some stress when her person breathes as she does in this video, and Merlina moves to release tension.
She reacts to her distress through wriggling and stretching, and it also helps her release some of the tension she creates in herself when she hears the breathing sound. Based on experience, the next step for her is to either leave or bite her person.
There are many ways we can release tension. We can cry, scream, tremble, shake, sing, and move and stretch as in the video. For us humans, even talking about it can help.
Exploring this is a part of TRE — Tension & Trauma Release Exercises, which uses the natural trembling mechanism in it body to release tension.