An exercise of particular importance for the development of Ki/Qi is the practice of deep abdominal breathing.
Sit in seiza (or cross-legged with a cushion underneath you in order to keep your spine straight). Adaptation to sitting in seiza should
 be built up gradually, increasing the time spent in this position by a 
few minutes every session. Sit lightly, with your back straight and 
shoulders relaxed so that the weight of your body falls naturally to 
your one point.
Inhalation should be prolonged, as a thin 
stream of air is drawn in through the nostrils at a regular, controlled 
rate. The sound of such a prolonged inhalation should be close to the 
letter `u'. And this inhalation should be done relaxedly with no 
straining. Moreover, even though the air is drawn in through the nose, 
the glottis at the back of the throat should be used to control the 
stream. By drawing the air in through contraction of the glottis, 
instead of `sniffing' the air, you will achieve a slow, steady stream.
The
 air you inhale should fill not only the chest cavity, but also the 
lower abdomen. Inhale deeply into the lower abdomen such that it expands
 normally, without undue strain or tensing of your stomach muscles. The 
idea is to breathe as fully and naturally as a child.
Keep 
your shoulders down and relaxed during the inhalation. When you have 
inhaled all that you comfortably can, rest quietly for a moment or so 
before beginning to exhale. 
Exhale through the mouth in a 
steady, concentrated, powerful (but relaxed) stream the sound of the 
exhalation resembles a `haa'. Again, there should be no strain. Don't 
attempt to exhale suddenly with great force.
Breathing 
exercises should be practiced daily. When combined with regular practice
 of the arts of Aikido this results in coordinated development.
 
