I think it's related to the images used, and the development of intent.
Nah. As one teacher of mine said about a I.S. skill related to breathing that he showed, "Many people would say it is qi... but really it is just that the human body can be conditioned more than most people think". Breathing exercises are like biceps exercises in that they're deliberate exercises of certain parts of the body. The problem is that someone has to show you how to access the "qi" to develop it. And a lot of people get bits and pieces and think that they know.