Among the fundamental elements for generating power are taijū no idō or body weight shift and taijū no dendō or body weight transmission.
The displacement of the body weight is when one moves his center of gravity.
The transmission of the body weight is the action of putting the weight into the opponent. For example when one is grasped at the forearm, to use this point of contact to transfer his weight to another. It is not pushing!
By performing tenshikei an internal distance is created, this internal distance is needed to be able to do body weight transmission. The power of this transmission is called “Ido-ryoku”.
How to create distance and space when grasped by the opponent?
If someone is grasping you on your wrist and twist you forward. You will feel it first in your wrist and elbow (1), the shoulder (2), it affects the other shoulder (movement will be felt front of the body (3), the twist will be go down at the back to the opposite hip (4), the movement will pass via the front of abdomen to the other hip (5), the knee (6) and the ankle (7). The feeling is important (taikan).
The untwisting is following the reverse order.
The opponent will not feel the untwisting until the power enters in his body with taijū no idō or body weight shift and taijū no dendō or body weight transmission.
from the book written by Akira Hino (2017) Listen to the Body.