One time I heard that many moves in kata were "formalized versions of spontaneous responses"
The "X" block, or cross block (juji uke) is one such move.
It is an often instinctive response to throw both arms up, crossed, in front of the face or over the head. Walking casually along and a bug flies at you, or a tree branch appears - both hands may fly up to cover.
The Juji Uke is merely a formalized version of this (what I call the "Oh crap" response). The key is how to utilize that instinctive position and follow up.


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