Patañjali divides the practice of yoga into eight stages. Yama, or restraint from vice, and niyama, or observance of purity and virtue, lay the moral foundation for practice and remove the disturbance of uncontrolled desires. Asana, or posture, and pranayama, or breath control, calm the physical body, while pratyahara, or withdrawal of the senses, detaches the mind from the external world. Internal control of consciousness is accomplished in the final three stages: dharana, or concentration, dhyana, or meditation, and samadhi . Through such practices yogis acquire miraculous powers, which must ultimately be renounced to attain the highest state. In samadhi the subject-object distinction and one's sense of an individual self disappear in a state usually described as one of supreme peace, bliss, and illumination. A common feature of different traditions of yoga is one-pointed concentration on a chosen object, whether a part of the body, the breath, a mantra , a diagram, a deity, or an idea.
Hindu tradition in general recognizes three main kinds of yoga: jnana yoga, the path of realization and wisdom, bhakti yoga, the path of love and devotion to a personal God, and karma yoga, the path of selfless action. Other classifications exist. Patañjali's yoga is known as raja, or
royal, yoga. Hatha yoga, which stresses physical control and postures, is widely practiced in the West, where it is the dominant form of yoga and is often divorced from yoga's spiritual traditions. In the United States, yoga as a physical and quasispiritual exercise regime has been popular especially since the 1960s. Kundalini yoga, especially associated with Tantra , is based on the physiology of the
subtle body, according to which seven major centers of psychic energy, called chakras, are located along the spinal column, with the kundalini, or
coiled energy in latent form, located at the base of the spine. When the kundalini is activated by yogic methods, it ascends the spine through the main subtle artery of the sushumna,
opening each chakra in turn. When the kundalini reaches the topmost chakra in the brain, samadhi is attained.
See S. Dasgupta, Yoga as Philosophy and Religion (1924, repr. 1973); I. K. Taimni, The Science of Yoga (1967); E. Wood, Yoga (1967); M. Eliade, Yoga (1969); P. Sinha, Yoga (1970); J. Varenne, Yoga and the Hindu Tradition (1976); R. Love, The Great Oom: The Improbable Birth of Yoga in America (2010); S. Syman, The Subtle Body: The Story of Yoga in America (2010); W. J. Broad, The Science of Yoga (2012).
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