'The' Diaphragm

The mid-thoracic diaphragm is one of the largest muscles in the human body and arguably the best single indicator of the quality of your aging. It is also hard to feel, so if you want to be aware of your diaphragm, it is helpful to key into parts of yourself that relate closely, such as the lower ribs. Or tuck your fingers under your lower ribs and cough... you'll feel it. But note that it is very misleading to refer to this big muscle as THE diaphragm. You have more and they have to work together, for the most part. Hard to coordinate them if you don't know they exist...

Vocabulary word of the day: Thoracoabdominal pressure gradient