Pectoralis major is popularly known as pecs.
It makes up the bulk of the chest muscles in the males and lies under the breast in the females.
It's in keeping this muscle habitually contracted that we make the biggest mistake in posturing the upper half of our torso.
We do so by pushing the shoulders down, which in turn
- presses the solar plexus down on its sides.
- turns the elbows in making them get stuck with the sides of the torso.
- shifts the fulcrum of the palms (they are a lever!) to their outer sides toward the little finger rather than inner, toward the thumb. The full arm is a lever too, which gets distortedly twisted outward as we push the shoulders down.
- pulls the neck down by keeping exerting constant pressure on the collarbones at their outer edges, which get wrongly placed and shaped below the neck in a horizontal way.
- pushes the lower protrusions of scapulae on the back closer to each other, while spacing the upper protrusions apart.
- pulls jaws down disturbing and distorting their alignment.
- pulls the temporomandibular joint down.
- narrows the lips in reducing their width and making their natural smile on the face disappear for good.
- pulls the eyelids and eyebrow down turning bright eyes dull and lifeless.
- pulls the earlobes down and out.
- pulls the skin on face down giving birth to wrinkles and dark circles under eyes on it.
Are we not sitting on the top of a volcano at our pectoralis major, playing with the fire that will burn us all!
[...] as we moved up to posture our upper torso right through stretching the pectoralis minor wide and pectoralis major [...]