The way of training in Aikido shares something in common with swordwork. In sword use, from the beginning of the fight to the end. there is always a distance of about two meters between the opponents. In Aikido, although you are not holding swords, you check the opponent at the moment the spacing becomes advantageous for you, Handling the sword in Aikido is based on the technique of advancing the whole body in an oblique form; this is somewhat different from the techniques of modern Japanese sport kendo.

As explained before, the Founder studied various kinds of budo; it is natural that they were adapted into the techniques of Aikido. But because the Founder acquired something beyond them, the essence of Aikido differs from that of other arts.

Occasionally the training of Aikido is misunderstood as simply being the training of forms (kata). But the variations of Aikido techniques are too numerous to be considered as such. If Aikido is practiced as mere form the essence of Aikido - "the movement of Nature is the movement of ourselves" - can not be reached.

The Founder therefore said:
"There is no form and no style in Aikido. The movement of Aikido is the movement of Nature - whose secret is profound and infinite." So it is essentially different from some of the other budo which cling only to forms. When we use the word "form," we mean that the techniques of Aikido are a series of endless spiritual forms. They are unified so closely with each other that they cannot be divided. This is beyond the concept of "form" in the conventional sense. The techniques of Aikido, as we can therefore see, are different from those of judo, kendo or karate, but its spirit is in accord with the secrets of these other arts.

A Dynamic Survey of Aikido
The techniques of Aikido are rationally structured from a dynamic viewpoint. They may be outlined as follows, The human body, in motion, becomes like a spinning top. When not in motion the body is in the stable posture of an equilateral tetrahedron. This triangle-stance is the ideal posture from which to start the techniques of Aikido. When the movement begins the body becomes like a spinning top. In this sense the techniques of Aikido should reach a state in which you can change the opponent's CENTRUM by your own spherical motion which revolves around your CENTRUM. Thus you maneuver and spin off your opponent with your motion. There is an old saying preserving a secret of jujutsu, "Push when pulled, and pull when pushed." It is clear from the following odes how the founders of the old jujutsu ryu taxed their ingenuity:

When the same concepts are explained by the principle of Aikido, it is, "TURN when pushed, and ENTER when pulled." (See section on techniques.) This circular motion is different from the straight movements of jujutsu. It has more variety. When it is fully utilized in budo, it leads to another more effective area. This is the development of spherical motions which consist of centrifugal and centripetal forces. For this reason you and the opponent are not in dualistic opposition in Aikido but are one unit in which both are under your control. Both are completely controlled by the centrifugal force away from you and the centripetal force toward you. When such a spherical motion is continued as a systematic unity, the graceful rhythm and circular movement unique to Aikido appear. For example, the force which is used in the ENTERING THROW checks the opponent's right hand with your HANDBLADE from a RIGHT-OBLIQUE POSTURE, flowing off his KI as you enter on your left foot to his right side. You continue turning your body rightward on your left foot in a sweeping motion to unbalance his body, and then, changing your body leftward, you enter again on the right foot. When this kind of powerful, continuous and spherical motion is carried out by every part of the body, the force of individual parts is joined together and executed systematically in natural, circular, spherical, and spiral-like ways. The rotation must be flexible and accurate, with a stable rock-like balance serving as the center. It is like a windmill which responds to a slight wind - even one which normally could not be felt by a human body -- and keeps rotating. Or it is like a top whose force of rotation extends to every part yet simultaneously concentrates and stabilizes its mass around the axis, supporting it - the top therefore maintains its balance. By this action it spins off or draws in everything it touches. Similar examples in natural phenomena are powerful whirlwinds and whirlpools. For these reasons it can be more easily understood why Aiki techniques of leading and throwing are based on movement from the hips. The Opponent is involved in this action of centrifugal and centripetal forces which you execute and is therefore placed in an unstable situation. He finds himself turning around the outer circle of your top-like movement. This puts her into a "state of having an unstable body position." For example, in the CORNER DROP, as soon as you have your left wrist grasped by the opponent's right hand, you stretch out your left hand powerfully to his right rear corner and stop his right foot with your right hand. This prevents the movement of the opponent's CENTRUM. When his right hand is pulled to his right rear while his CENTRUM is stopped, his form becomes unstable and he falls. The opponent, in actuality, is moving around the outer circle of your CENTRUM, and hence is unstable. When we analyze this motion and observe body positions and relationships of force, we know that the forces of the techniques are delicately worked out and related. Another example is seen in the WRIST IN - TURN or NIKYO. You hold the opponent's wrist while you are constantly turning around your center. Consequently he moves around your outer circle with his body unbalanced. His wrist is bent toward the "direction of natural bending," thus he moves in the same direction. Most of the joint techniques of Aikido employ the moving of joints in the direction in which they bend naturally. It is different from ordinary reversal techniques, which hurt the joints by turning them in a direction counter to natural bending. These "natural bending" techniques are used because the principles of circular and spherical motion are rationally utilized in Aikido. When we observed the Founder in action and considered these force relationships, we saw that the movement of his hands and feet traced spherical shapes as his motion accelerated around his stable hips. When holding a stick, his body and the stick took on the appearance of a spherical body. The stick looked almost as if it were alive. Thus when we train ourselves in Aikido we must study technique in order to be like a pyramid (equilateral tetrahedron) when not in motion, and to become like a spherical body when moving. The spherical body must be versatile, keeping its power contained, harmonizing the centrifugal and centripetal forces, just as a rubber ball rolls down a slope, lively bouncing no matter how bumpy the slope may be. These kinds of force relationships are worth studying further from the standpoint of Aiki Dynamics, but in training ourselves we should learn the state of "nomind," and not be shackled with the analysis of theories.

Aikido and Health
Most budo originated from a kind of physical training program, developed into self-defense arts, and then were refined into budo. A physical fitness program may be compared to preventive medicine programs. If we move our body adequately and if the movement agrees with Universal Nature, we will have a well-conditioned body and will not be affected by disease. Among the excellent warriors of whom we have heard, longevity is an outstanding characteristic. That they have practiced physical fitness during their training in budo certainly is related to this longevity. When we consider various physical fitness programs we will soon discover the value of Aikido. The movements of Aikido agree with the laws of Universal Nature which include a flowing flexibility and the keeping of a stable CENTRUM. The aim of Aikidoists is to be one with the Universe, in complete self-control . When we have self-control, we also have a posture which is completely alert. By exercising our whole body we approach improved health. Dr. Katsuzo Nishi, a man famous for his health-improvement theories says:

"When we watch people involved in Aikido, we see that their stance is like an equilateral tetrahedron. We watch them begin the characteristic spherical rotation. They change in various ways,extending and drawing, without losing their centered balance. Theirs are completely controlled figures. When the body is controlled, it is most healthy." This is the type of body we see when skilled Aikidoists are in action. The continuous and flexible motion based at the hips is like the performing of a dance. It is a graceful spherical motion. Observing such finger, wrist, foot and hip movements, all coordinated with the breath, we see that they agree with physical improvement ideals. The movements of every part of the body are unified into a systematically controlled whole.

First, BREATH POWER, which is the basic resilient power of Aikido, is extended from the CENTRUM. This naturally relaxes one's strength, which has stiffened various parts of the body. It becomes the basis of constructing a flexible but stable posture for both young and old.

Secondly, some cases have shown that spherical motion based on the hips, when it is executed with a stable posture, is helpful for correcting bone structures, especially the spinal column. For example, those who had drooping shoulders and bent spinal columns as a result of previous illnesses found their condition completely corrected after a year of adequate Aikido exercise.

Thirdly, the delicate movements of Aikido help accelerate blood circulation at every joint of the body and give adequate stimulation to some inner muscles which are not generally used. For example, when KNEE WALKING, the toes are necessarily moved and bent. Since most people in our modern age wear shoes, the exercise of such understimulated muscles will be beneficial for good health.

The basic PINNING TECHNIQUES; the First, Second and Third Teachings; all give impulse to the inner muscles. Skilled Aikido trainees' deep and subsurface muscles are well developed, and as elastic as a rubber ball. The Founder said that the joint exercises in the PINNING TECHNIQUES are to remove the "dust" which has accumulated around the joints.

In Aikido, techniques related to individual parts of the body are necessarily related to the whole. There are no radical techniques which use strength suddenly, or immediately cease using power. The spirit fills the whole body from head to toe in every case. Here lies the secret of Aikido in preserving a healthy body.

To exercise the body in this way, with adequate moderation, will no doubt lead to better health. It should be understood, however, that Aikido is budo and not a physical fitness program. Aikido improves health only as a result of its practice as budo.