2. Support
If you place your hand on your abdomen and you press the lower abdomen in, the stomach area comes out. You have two sets of muscles there. The lowest muscles of your abdomen give the support.

It's a small, supple action. It's like the shock absorbers of a car that absorb the bounding. You don't take a breath by using the chest. There's only one way of breathing. Whenever you breathe, you go down there to the lower abdomen. Instead of pushing against the muscle you use as a protective floor.