I'm right with you on this huoxingyang. I wonder if we also agree on the concept that internal principle for power generation is full body power. In other words, if I'm using an isolated mechanic, like rising power from the hips and legs, then that is external because it isn't full body. Full body means that every part of the body is working in harmony... the bones, muscles, nervous system, facia, tendons, ligaments, mind, spirit, etc. ALL connected together. No isolated mechanic. Do you also kind of see it this way? If I only use full body power, then that is internal. However, any combination is external. For example, if I use full body power and then add in some torso twist for extra power, this is external (mixed) because the torso twist is an isolated mechanic. Any mix of full body power generation with an isolated mechanic for power generation is still external. Building the structure for full body power generation is internal method. Building structure for other power generation mechanics is external method. Many martial systems are a mix of building structure for isolated power generation mechanics AND building structure for full body power generation. Are we on the same page on this?