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I'm not sure how the exercises you mentioned strengthen the
upper esophageal sphincter, but you said that the primary
purpose is to learn to "breathe with your diaphragm."
Fortunately, breathing with the diaphragm is not something
most of us have to "learn." We do it automatically, or else
we'd be in pretty big trouble. The diaphragm is the primary
muscle of inspiration. Every time we breathe in, we use the
diaphragm. Just wanted to clarify a bit of physiology.
Nancy Solomon