If you have a better idea I'd like to hear it.
https://www.mentalhelp.net/articles/anger-management-relaxation-techniques/
http://www.forbes.com/sites/daviddisalvo/2013/05/14/breathing-and-your-brain-five-reasons-to-grab-the-controls/#1c0ffe4b52aa
https://www.psychologytoday.com/blog/feeling-it/201304/breathing-the-little-known-secret-peace-mind
There are hundreds of scientific studies on-line that conclusively prove that focussing on the breath has both physical and mental health benefits. Don't believe me, just look.