Why Is Breath Such an Essential Part of Mindfulness?

There are five reasons why breathing may be a key component of mindfulness meditation. 

1. For starters, breath is still there, open, and accessible to all, making it an ideal meditation object. 
2. Second, understanding that we breathe represents our self-awareness, so air is inextricably tied to self-consciousness. 
3. Third, air is a scientifically observable visible indicator of happiness. 
4. Fourth, our limited capacity to change our breathing tells us that, though we are change agents, we are still a part of a mechanism outside our grasp. 
5. Finally, since breathing is so natural, it acts as a built-in "trainer" of consciousness, providing continuous practice in concentrating it, losing attention, and regaining it.

You may also want to read more about Mindfulness Meditation and Healing here.