Determining which Natural Energy is active in you is a physical process. By meeting hand-to-hand with a trained facilitator your body will be strong in one of the 9 Postures of Activation. It does not know how to hold the other postures effectively. To hold the other Postures you would have to resort to muscular/physical effort until you learn how to activate that center in your body. In addition to the posture that is active for your Natural Energy there is:

a specific facial expression,
a quality to how the eyes are used and what they look like,
an energetic signature that occurs when the Natural Energy is active
specific muscular and skeletal body development