I was doing a simple hanging stretch today, hands holding and feet hanging, fully relaxed and motionless when I began to just think of the word swing, and soon enough my body began to swing slightly without actually engaging my body to do so, purely from the thought of the word. I thought i'd play around with it later in San ti, up, down, whatever, it worked the same.
For some this might be bloody obvious and going over old ground but I was just interested in peoples thoughts on this, what is it called ? Why does it happen ? Is there any usage in the internal arts ? eg intention training. Nei dan comes to mind as we fix our attention to areas of the body with the aim of a reaction which can be felt.
Cheers