In the below video Koretoshi Maruyama Sensei demonstrates and provides instruction on how strikes to the torso (munetsuki) are executed in Aikido Yuishinkai.
The demonstrated method of munetsuki generates its power through the lower limbs to take full advantage of what is sometimes referred to in Aikido as the vertical-horizontal plane. In most simple terms – one sinks to move forward.
The result is that the strike is backed by the entire body of the nage rather just the activation of the muscle groups in the upper arm. It also allows the nage’s body to naturally move off the line of an incoming direct attack and facilitates extra strike reach than would normally be expected (see below video).
For further videos and discussion of atemi waza in Aikido training on this site see – Atemi arts (striking)
Have a great week.
Aikido Warrior Dojo