Because breathing is literally the first thing that happens when we are born and the last thing we do when we die. It is our life force and it bridges the connection between our minds and our bodies. When we deepen our breathing and take charge of regulating it, we provide ourselves with the opportunity to calm our nervous system and notice what is happening in our minds and our body without judgement. And noticing frees you up to make choices. You are not at the mercy of anyone if you really think about it. No one is making you think or behave the way you do. (Well, unless they have a gun to your head and then that's a different story but it mostly doesn't happen in our wee town.) We get reactive when we forget to pause, breathe and decide....what we want to do, what we want to say etc etc Lots of people talk about taking holidays as if they are holding their breath and waiting for the opportunity to gasp, exhale and then finally relax. When your life and your conversations become like a comfortable breath all the time, then you'll know why people talk about breathing as a way of coming back into balance. It's still a work in progress for me as I'm sure it is for most people in this crazy, judgemental, fast pacedsociety. However.....I'm noticing, choosing and it's getting better!
If you want to practice breathing try this video: https://youtu.be/N9jmO6xwFfs