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Principle of Aiki and its Application in Aikido and Aikijujutsu
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Bernie Lau

Explosive Techniques of Aikijujutsu Bernie Lau

The application of Aiki in the Aikijujutsu techniques video by Bernie Lau is analysed below. 

Analysis

In the video, at a time of 00.00, Uke attacks with an overhead strike with a knife. Tori steps towards Uke and blocks Uke's arm. Tori induces Uke to apply Aiki by pressing down on Uke's attacking arm whilst pushing it sideways with his other arm. Pressing down on Uke's attacking arm induces him to momentarily relax his upper body whilst extending his front leg in preparation to push upwards.  Consequently, the muscle torque about the foot joint of Uke's front leg, due to him pushing upwards, is then in the opposite direction to that required to balance the contact reaction force, due to Tori pushing Uke's arm to the side. Uke is then unbalanced to the side.

Analysis

In the video, at a time of 01.04, Uke attacks with a strike to the side of Tori's head with a knife. As Uke steps forward with his right leg, Tori steps forward and induces Uke to apply Aiki by applying an upward atemi to Uke's face. The upward atemi induces Uke to straighten his body to minimise the impact of the atemi. Consequently, the muscle torque about Uke's right leg ankle joint, due to him straightening his body, is in the opposite direction to that required to slow his forward momentum. Uke is then unbalanced to the front.

Analysis

In the video, at a time of 04.04, Uke attacks with a hand strike to the side of Tori's head. Tori blocks Uke's attacking arm with his left arm. On contact,Tori applies Aiki by reversing the muscular torque about his rear foot so as to rotate the contact point sideways about his rear foot. Consequently, Uke is unbalanced to the side by his own attacking force. 

Analysis

In the video, at a time of 04.54, Uke attacks by grabbing Tori's neck with both hands. Tori induces Uke to apply Aiki by applying an atemi to Uke's solar plexus as Tori moves to the side. The atemi induces Uke to bend at the waist to minimise the impact of the atemi. Consequently, the muscle torque about Uke's waist joint, as he bends forward, is in the opposite direction to that required to balance the contact reaction force due to him being pulled to the front side. Uke is then unbalanced to the front. 

Bernie Lau Aikijujutsu

The application of Aiki in the Aikijujutsu techniques video by Bernie Lau is analysed below.

Analysis

In the video, at a time of 14.17, Uke holds Tori's wrists from the rear. Tori moves his left hand towards his right and grasps Uke's right wrist. This action locks Uke's left wrist joint at the base of the thumb. Tori induces Uke to apply Aiki by turning his body towards the left which increases the pressure on Uke's locked wrist joint and causes him to bring his body forward, to reduce the pressure, by relaxing his upper body and reversing the muscle torque about his front foot ankle joint.  Consequently, Uke is unbalanced as the muscle torque about the ankle joint of Uke's front foot is now in the opposite direction to that required to resist Tori moving forwards.  Uke releases Tori's right wrist to prevent being thrown forwards.

Analysis

In the video, at a time of 14.44, Uke holds Tori's upper arms from the rear. Tori induces Uke to apply Aiki by lowering his weight onto his left foot and rotates his body to the left about his left foot. As Tori lowers his weight, Uke relaxes his upper body and extends his leg(s) upwards in preparation to resist Tori's downward movement. Consequently, Uke is unbalanced as the muscle torque about Uke's ankle joints are now in the opposite direction to that required to resist Tori moving forwards and to the left.  With Uke being unbalanced he is unable to resist Tori extracting his right arm from the hold as he moves forward.

Explosive Techniques of Aikijujutsu Bernie Lau Part 1

The application of Aiki in the Aikijujutsu techniques video by Bernie Lau is analysed below.

Analysis

In the video, at a time of 05.20 Uke attacks with a knife thrust. Tori side steps Uke's thrust and lightly makes contact with Uke's wrist so as not to stop its forward movement. As the knife comes to a stop, Tori induces Uke to apply Aiki by restraining Uke's wrist as he applies an atemi to Uke's face.  The atemi induces Uke to straighten his body as he pulls against the restraint.  Consequently, the muscle torque about the foot joint of Uke's front leg, due to him straightening his body, is then in the opposite direction to that required to balance the contact reaction force, due to Uke pulling against the restraint. Uke is then unbalanced to the front.

Analysis

In the video, at a time of 06.17 Uke attacks with a knife thrust. As Uke steps forward Tori induces Uke to apply Aiki by applying an atemi with his left elbow.  The atemi induces Uke to straighten his body as he steps forward.  Consequently, the muscle torque about the ankle joint of Uke's front leg, due to him straightening his body, is then in the opposite direction to that required to slow down his forward momentum. Uke is then unbalanced to the front.