Focus on the Exhale 

In the yogic practice of breath control (or pranayama), the exhale has a special function. While the inhale is stimulating, the exhale is relaxing. While the inhale is about bringing energy into the body, the exhale is about releasing stress, toxins, and pain.

Because of this, you can use conscious breathing as a break in your day. By focusing on your exhale, you can let go of the past and come into the present with a renewed commitment. Here's how:

Sit up in your chair with your feet on the floor and a long spine. Close your eyes and focus on your breath. Inhale through the nose, feeling your spine get longer and taller. Then exhale through your mouth with a deep sigh. As you exhale, visualize the moments of your day moving away from you.

Try this for a few minutes anytime you need to let go of something. It can have a profound effect on your emotional and physical health.
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http://www.yogajournal.com/dailyinsight/2008_09_18.html.