Breathing is the basis of life, just as you breathe so is your life. It happens automatically without paying too much attention to it and that's how it goes.
Poor breathing is a direct cause of multiple disorders, both on a nervous level and in general. Usually we don't breathe, we don't know what it really means and what you can do with your breathing, we just cope and live more or less decently, not really enjoy a full life.
There are multiple examples of people who through control and awareness of their breathing can do really amazing things, like Win Hof who is able to completely control his body temperature in cold water for a long time without any adverse effect on his health or neutralize a virus injected into his body in a controlled way in a laboratory.
The yoga master Iyengar also had a really powerful and decisive support in his early days with yoga because of the sickly weakness of his body since childhood.
By changing your breath you can change your life, activating the awareness you have over it you will change your life in the direction you really feel necessary.

Be Mindful Yoga we give special attention to pranayama, not only as a practice at the beginning or end of a class, but mainly as a fundamental part of it.