According Geshe Tenzin Yangtong:
Dzogchen Yoga or Trul-Khor is the system which came down through the unbroken oral transmission from Zhang-Zhung Nyen Gyu lineages.
The core of the transmission engages the body, mind and spirit of the practitioner in a series of breath, sound and movement exercises, each relating to a specific element.
The 5 Elements of Fire, Wind, Space, Water and Earth, are the foundational fiber of Tibetan medicine and healing; their core theory being everything that exists in this universe is made of the 5 Elements and therefore responsible for the formation of each tissue cell.
In practicing Trul khor, one will be able to identify and alleviate physical discomfort or pain, emotional and mental disturbances.
These easy to perform yet powerful healing exercises can be used as a support to other meditation practices or practiced alone to clear obstacles caused by disease or strong negative emotions, and to clear, balance and harmonize your energy field.