That question is where it all started. No book had an answer to it. So Rico Brunner looked for himself, over many years and with a great many people. A model grew out of this: energy field mechanics. It describes how an energy field is built, how its parts work together and what happens when that interplay stops working.
Energyology is the name for this knowledge. Rico chose it on purpose: the model is meant to complement psychology, not compete with it.