脇晒し
The name of this technique says it all: "exposed armpits."
It is a form of restraint in which the hands are secured behind the head, causing the arms to lift and leaving the armpits completely exposed.
This position is physically demanding for the person being tied, as it requires strong core engagement to maintain.
It is one of the foundational techniques of Yagami Ryu and is part of the Shoden Keito (初傳系統) group—techniques rooted in solid structural principles.
Caution: Due to its physical intensity, not everyone can perform this technique safely.