Deep learning is transformative. To move from where you are to where you want to be requires a map, or at least a path. The problem with NeiJia is that, for the beginner, there is no understandable map and the path seems convoluted at best, unintelligible at worst. In UCB Program internal practice, From Standing to Pearls, the progression of capacity, skill and understanding is predictably linear and seems, on the surface, perfectly reasonable. To train the 5 Elements is to break with this surface rationality and embrace the unreasonable.
Chinese Martial Arts are sometimes divided into two adversarial camps: Internal vs External. This has always bothered me as it is usually in some kind of advertising where I see these terms. Over the years as I have kept abreast of anatomy, neuroscience research and related disciplines as part of ongoing professional development, I have always looked to resolve what I perceive a false distinction. In 2010, I published a draft definition of internal practice in my FAQ. Since then I have been fortunate to receive feedback and continue to refine the definition.