I find this meditation is great when you feel like the world is spinning out of control around you or you just need a little stability. I've taken the meditation from the book Wheels of Life by Anodea Judity, PhD
I often begin my classes with some three part, or yogic, breathing. It has so many benefits, such as to the diaphragm, providing extra oxygen into the blood stream and surrounding organs. And let's face it, this might be the only time you'll take a deep breath today.