What man ordinarily perceives and experiences through the mind and senses is only a small slice of the full spectrum of what we call reality. How peacefully and joyfully the human being is capable of living in the world depends less on outside situations, and more on whether or not one is able to remain in tune with reality as it is. When there is a lack of insight and clarity of perception into things as they are, suffering naturally follows. This is the understanding of yoga - that it is because of avidya (ignorance) that all of man's sufferings are born.
Consciousness is not something fixed, but can be stretched and expanded beyond its present limitations. Shunya Yoga is an inner science for the expansion of consciousness towards freedom from suffering and self-realization. Through the use of asanas (physical postures), pranayam (breath control), mudras (seals), bandhas (locks), and kriyas (purification exercises), the first phase of Shunya Yoga involves purification of the energies of the mind and body as preparation for meditation. Physical health is an important part of the science of yoga but physical health alone is not enough. The causes of human suffering are created in the mind and is through a deeper awareness and insight into the mind itself that the causes of suffering inner transformation is possible. Having cut through several physical and mental obstacles (kleshas), then begins the next phase of Shunya Yoga - meditation (dhyana). It is through dhyana where the process begins of watching the mind from moment to moment without judgement. In this meditative clarity, the mind becomes like a mirror - you see yourself as you are. Once the mind's lake has become absolutely still then there comes a direct perception of the true nature which lies at the source of one's being. Timeless and Boundless, Birthless and Deathless, it is this state of consciousness of the finite merging with the infinite which is the state of Yog (“Union”) or self-realization.
After coming to a glimpse into one`s enlightenment (nirvikalpa samadhi), the final phase of Shunya Yoga is to bring one’s enlightenment into daily life, as there can be no freedom outside of life itself, nor can there be life outside of freedom. In this communion with your own Buddha Nature, life becomes a continuous expression being in communion with the source. This is the state of sahaja samadhi (effortless, spontaneous enlightenment).