If you are dealing with uncontrollable Stress, Chronic Injuries, tightness in upper body, , lower back pain. This might be the answer for you.
As a Yoga instructor I breath consciously a lot for a living, but I still was unsure when to breath chest to belly and when to breath belly to chest. This has caused me suffering. In the last 2 days I have learned the correct timing of this. This article does a good job to explain the difference and when to do what.