Shizuo Imaizumi

Shizuo Imaizumi's Ki Aikido Course: Katatori Ikkyo

The application of Aiki in the technique demonstrated by Shizuo Imaizumi is analysed below. 

Analysis

Tori takes a small step forward with his right foot that induces Uke to push backwards with his right arm. Tori goes with Uke's push by stepping backwards with left leg. As Uke steps forward, Tori applies an upward atemi that induces Uke, to apply Aiki, by reversing the muscle torque about the ankle joint of his right leg so as to minimise the impact of the atemi by straightening his body. Uke becomes unbalanced to the front by his forward momentum. 

Shizuo Imaizumi's Online Ki Aikido Video Course: Tenchinage

The application of Aiki in the technique demonstrated by Shizuo Imaizumi is analysed below. 

Analysis

Initially, Tori is just being held by his wrists. Tori then extends his left arm and moves with his body weight downwards and towards Uke's rear. Uke unable to stop the force of this movement without becoming unbalanced, does not resist, allowing his right arm to follow Tori's left arm whilst bringing his Centre of Mass (hips) forward. This action by Uke improves his ability to push forward and therefore resist any attempt by Tori to unbalance him to the rear. Due to Tori lowering his weight Uke is also pulling upwards. The stage is now set to apply Aiki.

As Tori rises and uses his right arm to push Uke to the rear, Uke experiences a Contact Reaction Force (UCRF) to the rear on his left hand. To resist/balance the rotational effect of this force about Uke's ankle joint he apples muscle torque about the ankle joint in the opposite direction.  However, as Tori rises Uke also rises due to him pulling upwards. To rise, Uke has to reverse the muscle torque about the ankle joint and by doing so, becomes unbalanced to the rear. Thus the action of rising whilst resisting a force to his rear unbalances Uke to the rear.

Shizuo Imaizumi's Ki Aikido Course: Katate Kosa Tori Irimi Nage