Energy is shrouded in mystery because we can’t see it. What we see and feel as the materialization of energy can be confusing as well. Yoga is sometimes described as a method to manage energy. That refers to the energy of thought and intention. The means to that is physical energy because physical gives bodily sensation to something intangible.
In yoga we create the sensation of energy by giving it weight. We contract muscles to create force. We synchronize the restriction and release of the muscles in coordination with the breath.
The first weight is made by the windpipe. The breath becomes sensational and intimate as you orchestrate the narrowing of the windpipe to hear breath and feel it in a pleasing way.
There are also muscle groups that act as sphincters or round muscles. The constriction of those sphincters is sometimes referred to as bandhas.
Bandhas turn on as we create force along the spine, pelvis and shoulders by engaging the muscles of the limbs, buttocks and belly with precision to ignite our posture. The effort of the muscles will have varying effects on our spine depending on the pose. We are not just moving muscles and bones but corralling energy to become form.
Asana is the intensification of awareness. When that awareness dissipates we can escalate the movement of energy by tweaking the posture. We are moving energy.
A finished posture is the eye of the storm. Force formed a shape to contain the quiet. Then energy no longer needed weight. You became the sum of that energy for the moment until something shifted as it always will.