One of the main premises of Yin Yoga is that we work with the energy body as well as with the physical body. Through the process of piezoelectricity, physical stresses can create within our body electrical currents. Here is an article describing some interesting research which shows how a simple mechanism allows a cell to detect electric fields. Still have to work out how this make the cell follow the field. I would suspect this helps explains a lot of how energy medicine works.
In the abstract to the actual research we find, "A variety of animals are able to sense and react to electric fields, and living human cells will move along an electric field, for example in wound healing. Now a team lead by Min Zhao at the UC Davis Institute for Regenerative Cures has found the first actual "sensor mechanism" that allows a living cell detect an electric field. The work is published Oct. 9 in the journal Nature Communications."
Ken-ichi Nakajima, Kan Zhu, Yao-Hui Sun, Bence Hegyi, Qunli Zeng, Christopher J. Murphy, J. Victor Small, Ye Chen-Izu, Yoshihiro Izumiya, Josef M. Penninger, Min Zhao.KCNJ15/Kir4.2 couples with polyamines to sense weak extracellular electric fields in galvanotaxis. Nature Communications, 2015; 6: 8532 DOI: 10.1038/ncomms9532