Using the Greek story of the Twelve Labors of Hercules, which outlines the progressive stages of spiritual development that spiritual practitioners in all spiritual traditions go through, this book presents full details on the step-by-step progression of the physical transformations that occur to practitioners. Whenever someone starts to consistently cultivate spiritual practice in a devoted way, there are physical changes that will occur to the human body. These physical transformations, called "gong-fu" in the eastern spiritual schools, are non-denominational signposts of spiritual progress. If you cultivate spiritual practice sufficiently then these phenomena will arise. If you don't practice correctly, they simply won't appear. Their appearance is a matter of proper devoted effort. These phenomena include such things as the awakening of kundalini (yang chi) within the body, the opening of the chakras and purification of the body's energy channels, hormonal transformations, the calming of consciousness, the experience of refined mental states described as "emptiness," and various other mental and physical phenomena. Normally people think these phenomena only occur to individuals following eastern cultivations traditions such as yoga, Buddhism, Hinduism, Taoism, and Vajrayana. However, these phenomena that arise are totally non-sectarian and non-denominational.