Not Convinced That Proper Deep Breathing Is One Of The Most Important And Beneficial Things You Can Do? Then Read:

Super Power Breathing, 23rd Edition: For Super Energy, High Health & Longevity by:
Paul C. Bragg, N.D., Ph.D and Patrica Bragg, N.D., Ph.D:
http://www.amazon.com/Super-Power-Breathing-23rd-Longevity/dp/0877901201