air inside the lungs is expelled out of the body in
this action and it is called Rechak in Yoga.
The pressure on the inside air is increased by reducing
the volume of the lungs; this is effected by the 3 reverse
actions as following.
1. The diaphragm is pushed up.
2. The ribs are pulled down.
3. The ribs are closed inside as the shutters
of the windows are closed.
As the volume inside the lungs is reduced, the air pressure
is increased and the air is forced out. As the air is
forced out, the air pressure is reduced to atmospheric
pressure. This completes the exhalation process.