Mel Barker wrote:
We don't talk about Ki much in our dojo, and we teach unbendable arm to beginners in two minutes without having them visualize anything or mentioning the work ki.
The importance of it lies in one's ability to use the effect while doing aikido I think. Otherwise, it's a nice party trick.
What about the rest of the day when you're off the mat? Shouldn't you be extending ki during the other 23 hours of the day?
Unbendable arm is a simple demonstration of ki extension. BTY the Ki Society has changed it's understanding from "Extend Ki" to add "Ki is Extended". This means that your arm should always be unbendable. That your natural state of being is extending ki, you shouldn't have to do or think of anything special.