1. Place one hand just above your belt line, and the other on your chest, right over the breastbone. You can use your hands as a simple biofeedback device. Your hands will tell you what part of your body, and what muscles, you are using to breathe.
2. Open your mouth and gently sigh, as if someone had just told you something really annoying. As you do, let your shoulders and the muscles of your upper body relax, down, with the exhale. The point of the sigh is not to completely empty your lungs. It's just to relax the muscles of your upper body.
3. Close your mouth and pause for a few seconds.
4. Keep your mouth closed and inhale slowly through your nose by pushing your stomach out. The movement of your stomach precedes the inhalation by just the tiniest fraction of a second, because it's this motion which is pulling the air in. When you've inhaled as much air as you can comfortably (without throwing your upper body into it), just stop. You're finished with that inhale.
5. Pause. How long? You decide. I'm not going to give you a specific count, because everybody counts at a different rate, and everybody has different size lungs. Pause briefly for whatever time feels comfortable. However, be aware that when you breathe this way, you are taking larger breaths than you're used to. For this reason, it's necessary to breathe more slowly than you're used to. If you breathe at the same rate you use with your small, shallow breaths, you will probably feel a little lightheaded from over breathing, and it might make you yawn. Neither is harmful. They're just signals to slow down. Follow them!
6. Open your mouth. Exhale through your mouth by pulling your belly in.
8. Continue with Steps 4-7.
This exercise leads to feeling relaxed and calms you down. It is just the antidote needed for tension and stress of the city. This is the basic breathing variation which forms a good foundation for Pranayama (one limb of Yoga).