Let�s consider the mechanical aspects of breathing movements. The movements of the belly-chest or front wall of the body on one hand and spine movements on other hand produce the feeling of Chi movement around the body trunk, so called Small Chi Circulation.

In Hatha-Yoga the feeling of the air passing thru the nostrils passages on the left and on the right sides of body will produce the feeling of the prana moving thru Ida and Pingala respectfully.

In all these activities the limbs movements and vertical turnings of the body play no role. In other words all above mentioned activities are based on the minimal bodily movements which are the breathing movements of the still body.

In ISAI, contrary to the still positions described above, there are numerious turnings and rotations of body and limbs in addition to the breathing. These turning movements are based on openings and closings of hips and shoulders which are connected thru chains of the body as was described above.

Generally speaking closing movements are related to intaking the air, stretching and arising the body and collecting the energy.
The opening movements are related to expelling the air, sinking and turning the body and releasing or issuing the energy of the body.
The friction with the ground is stronger during arising of the body. The turning is more convinient when the friction is in its minimum, it means during the dropping of the body. This is an explanation why in Taiji Chuan releasing of the energy and sinking come together. This sinking or dropping of the body is like falling after the jumping in the air but in microscopic scale. The moment of the actual strike or kick is a moment when a friction berween legs and floor is in maximum.
The time delay between the shoulders and hips rotations is responsible for what is called in Taiji Chuan �in Yin presents Yang and in Yang presents Yin�.

Like in baloon the air flow from closed areas to the openings so in the human body the energy or Ruah flow from closings to and thru the openings along the chains.
These consequent passing of the Ruah combined with the breathing will produce what Chinese call Yang and Yin flows. Thru opened chains will flow Yang or active energy and closed chains will contain the Yin or passive energy.
In ISAI we speak about active or passive Ruah, which express itself (active) or collecting inside the body (passive).
Actually there are no closed or opened chains but chains which turn from opened to closed (closing chains, the Ruah is passive) or contrary from closed to opened (opening chains, the Ruah is active). The situation is totally dynamic, always changing, so every opening contains closing tendency and every closing tends to the opening.
Also every active Ruah partially is passive and vice versa.
It is very importatant that in ISAI we deal not with positions or statical situations but only with dynamic processes.

So during the inhalation External Energy or Ruah of Universe (Ruah Olam) will enter thru nostrils and flow downward on the belly-side of  the backward fish. In the very same time the Human Energy or Human Ruah (Ruah Adam) flows upward on the belly-side of the forward fish and flow down on the belly of the backward fish.
These two opposite flows of energy inside the body produce stability and enrich the body with energy.
Their blending  with Ruah Olam will produce Internal Energy of  Person (Ruah Pnimit) which is temporary. It is like two fish that swallow up their food.

During expelling of the air the Ruah Pnimit will separate into Ruah Olam and Ruah Adam. It is like two fish that spit out their food.
Ruah Adam will ascend along the the spine and descend along the belly.
This is an active interchange between the Divine and Human, between the Personal and Universal.

The humans are like a pot (Klee) which �breath in� and reflect the Ruah Olam.
In order to take from Ruah Olam we have to give from our Ruah Adam and in order to give we have to take in the widest and deepest meaning of these words.

Actually speaking when you consider you work with a partner its not you that striking him but the outgoing Ruah of Universe (Ruah Olam). This means that your internal involvement in the strike will last until the actual moment of strike itself, but in the moment of strike itself you is not involved with you partner but detached.

The openings and closings of the hips and shoulders (done by turning and rotating of hips and shoulders area) serve similar purpuse to the openings and closings as practised in Hatha Yoga (Mula Bandha and Jalandhara Bandha) or in ChiGong but is much more dynamic.
The highest pressure of the Ruah Pnimit will be felt inside the human body just near the hips and shoulder closings.
These places correspond to the Lower and Middle TanDien (ChiGong) or to the correspondent Chakras in Hatha-Yoga.
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