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Asana (Sanskrit: आसन āsana [ˈɑːsənə] 'sitting down', < आस ās 'to sit down') is a body position, typically associated with the practice of Yoga, originally identified as a mastery of sitting still. In the context of Yoga practice, asana refers to two things: the place where a practitioner (or yogin, in general usage), yogi (male), or yogini (female) sits and the manner (posture) in which he/she sits. In the Yoga sutras, Patanjali suggests that asana is "to be seated in a position that is firm, but relaxed" for extended, or timeless periods.
As a repertoire of postures were promoted to exercise the body-mind over the centuries, to the present day when yoga is sought as a primarily physical exercise form, modern usage has come to include variations from lying on the back and standing on the head, to a variety of other positions. However, in the Yoga sutras, Patanjali mentions the execution of sitting with a steadfast mind for extended periods as the third of the eight limbs of Classical or Raja yoga, but does not reference standing postures or kriyās. Yoga practitioners (even those who are adepts at various complex postures) who seek the "simple" practice of chair-less sitting generally find it impossible or surprisingly grueling to sit still for the traditional minimum of one hour (as still practiced in eastern Vipassana), some of them then dedicating their practice to sitting asana and the sensations and mind-states that arise and evaporate in extended sits.
Asana later became a term for various postures useful for restoring and maintaining a practitioner's well-being and improving the body's flexibility and vitality, with the goal of cultivating the ability to remain in seated meditation for extended periods. Asanas are widely known as "Yoga postures" or "Yoga positions".
The word asana in Sanskrit does appear in many contexts denoting a static physical position, although traditional usage is specific to the practice of yoga. Traditional usage defines asana as both singular and plural. In English, plural for asana is defined as asanas. In addition, English usage within the context of yoga practice sometimes specifies yogasana or yoga asana, particularly with regard to the system of the Ashtanga Vinyasa Yoga. That said, yogasana is also the name of a particular posture that is not specifically associated with the Vinyasa system, and that while "ashtanga" (small 'a') refers to the eight limbs of Yoga delineated below, Ashtanga (capital 'A') refers to the specific system of Yoga developed by Sri Krishnamacharya at the Mysore Palace.
Yoga first originated in India. In the Yoga Sutras, Patanjali describes asana as the third of the eight limbs of classical, or Raja Yoga. Asanas are the physical movements of yoga practice and, in combination with pranayama or breathing techniques constitute the style of yoga referred to as Hatha Yoga. In the Yoga Sutra, Patanjali describes asana as a "firm, comfortable posture", referring specifically to the seated posture, most basic of all the asanas. He further suggests that meditation is the path to samādhi; transpersonal self-realization.
The eight limbs are, in order, the yamas (restrictions), niyamas (observances), asanas (postures), pranayama (breath work), pratyahara (sense withdrawal or non-attachment), dharana (concentration), dhyana (meditation), and samadhi (realization of the true Self or Atman, and unity with Brahman (The Hindu Concept of God)).
Common practices 
In the Yoga Sutras, Patanjali suggests that the only requirement for practicing asanas is that it be "steady and comfortable". The body is held poised with the practitioner experiencing no discomfort. When control of the body is mastered, practitioners are believed to free themselves from the duality of heat/cold, hunger/satiety, joy/grief, which is the first step toward the unattachment that relieves suffering. This non-dualistic perspective comes from the Sankya school of the Himalayan Masters.
- The stomach should be empty.
- Force or pressure should not be used, and the body should not tremble.
- Lower the head and other parts of the body slowly; in particular, raised heels should be lowered slowly.
- The breathing should be controlled. The benefits of asanas increase if the specific pranayama to the yoga type is performed.
- If the body is stressed, perform Corpse Pose or Child Pose
- Such asanas as Sukhasana or Shavasana help to reduce headaches.
Pranayama, or breath control, is the Fourth Limb of ashtanga, as set out by Patanjali in the Yoga Sutra. The practice is an integral part of both Hatha Yoga and Ashtanga Vinyasa Yoga in the execution of asanas.
Patanjali discusses his specific approach to pranayama in verses 2.49 through 2.51, and devotes verses 2.52 and 2.53 of the Sutra, explaining there the benefits of the practice. Patanjali describes pranayama as the control of the enhanced "life force" that is a result of practicing the various breathing techniques, rather than the exercises themselves. The entirety of breathing practices includes those classified as pranayama, as well as others called svarodaya, or the "science of breath". It is a vast practice that goes far beyond the limits of pranayama as applied to asana.
Surya Namaskara 
Surya Namaskara, or the Sun Salutation, which is very commonly practiced in most forms of yoga, originally evolved as a type of worship of Surya, the Vedic solar deity. Surya, the Hindu solar deity by concentrating on the Sun, for vitalization.
The physical aspect of the practice 'links together' twelve asanas in a dynamically expressed series. A full round of Surya namaskara is considered to be two sets of the twelve asanas, with a change in the second set where the opposing leg is moved first. The asanas included in the sun salutation differ from tradition to tradition.
The physical aspect of what is called yoga in recent years, the asanas, has been much popularized in the West. Physically, the practice of asanas is considered to:
- improve flexibility
- improve strength
- improve balance
- reduce stress and anxiety
- reduce symptoms of lower back pain
- be beneficial for asthma and chronic obstructive pulmonary disease (COPD)
- increase energy and decrease fatigue
- shorten labor and improve birth outcomes
- improve physical health and quality of life measures in the elderly
- improve diabetes management
- reduce sleep disturbances
- reduce hypertension
The emphasis on the physical benefits of yoga, attributed to practice of the asanas, has de-emphasized the other traditional purposes of yoga which are to facilitate the flow of prana (vital energy) and to aid in balancing the koshas (sheaths) of the physical and metaphysical body.
Number of positions 
In 1959, Swami Vishnu-devananda published a compilation of 66 basic postures and 136 variations of those postures. In 1975, Sri Dharma Mittra suggested that "there are an infinite number of asanas.", when he first began to catalogue the number of asanas in the Master Yoga Chart of 908 Postures, as an offering of devotion to his guru Swami Kailashananda Maharaj. He eventually compiled a list of 1300 variations, derived from contemporary gurus, yogis, and ancient and contemporary texts. This work is considered one of the primary references for asanas in the field of yoga today. His work is often mentioned in contemporary references for Iyengar Yoga, Ashtanga Vinyasa Yoga, Sivananda Yoga, and other classical and contemporary texts.
In 2007, public awareness of increasing attempts to patent traditional yoga postures in the US, including 130 yoga-related patents in the US documented that year, prompted the government of India to seek clarification on the guidelines for patenting asanas from the US Patent Office. To clearly show that all asanas are public knowledge and therefore not patentable, in 2008, the government of India formed a team of yoga gurus, government officials, and 200 scientists from the Council of Scientific and Industrial Research (CSIR) to register all known asanas in a public database. The team collected asanas from 35 ancient texts including the Hindu epics, the Mahabharata, the Bhagwad Gita, and Patanjali's Yoga Sutras and as of 2010, has identified 900 asanas for the database which was named the Traditional Knowledge Digital Library and made available to patent examiners.
See also 
- Monier-Williams, Sir Monier (1899). A Sanskrit-English Dictionary. Oxford Clarendon Press, p. 159
- s:Hatha Yoga Pradipika/1#Asanas
- "Patanjali Yoga sutras" by Swami Prabhavananda , published by the Sri Ramakrishna Math ISBN 81-7120-221-7 p. 111
- Verse 46, chapter II; for translation referred: "Patanjali Yoga Sutras" by Swami Prabhavananda , published by the Sri Ramakrishna Math ISBN 81-7120-221-7 p. 111
- Feuerstein, Georg (1996). The Shambhala Guide to Yoga. Shambhala Publications, Boston. pp. 26
- Patanjali (± 300-200 B.C.) Yoga sutras, Book II:29
- Syman, Stefanie (2010). The Subtle Body: The Story of Yoga in America. Macmillan. p. 5. ISBN 0374236763. "But many of those aspects of yoga—the ecstatic, the transcendent, the overtly Hindu, the possibly subversive, and eventually the seemingly bizarre—that you wouldn’t see on the White House grounds that day and that you won’t find in most yoga classes persist, right here in America."
- Arya, Pandit Usharbudh (aka Swami Veda Bharati) (1977/1985). Philosophy of Hatha Yoga. Himalayan Institute Press, Pennsylvania.
- Swami Prabhavananda (Translator), Christopher Isherwood (Translator), Patanjali (Author) (1996, 2nd ed.). Vedanta Press.
- Feuerstein, Georg (2003). The Deeper Dimensions of Yoga: Theory and Practice. Shambhala Publications, Massacheusetts.
- Rama, Swami (1980). Living with the Himalayan Masters. Himalayan Institute Press, Pennsylvania; India.
- Desikachar, T. K. V. (1999). The Heart of Yoga: Developing a Personal Practice. Rochester, Vt: Inner Traditions International. ISBN 0-89281-764-X.
- Taimni, I. K. (1996). The Science of Yoga. Adyar, Madras: The Theosophical Publishing House. ISBN 81-7059-212-7. Eight reprint edition.
- Kriyananda, Swami. The Art and Science of Raja Yoga, ISBN 81-208-1876-8
- Yogananda, Paramhansa, The Essence of Self-Realization, ISBN 0-916124-29-0
- Rama, Swami (1988). Path of Fire and Light, Vols. 1 & 2. Himalayan Institute Press, Pennsylvania; India.
- Easa, Leila. "How to Salute the Sun". Yoga Journal. Retrieved 20 March 2013.
- Ross A, Thomas S (January 2010). "The health benefits of yoga and exercise: a review of comparison studies". J Altern Complement Med 16 (1): 3–12. doi:10.1089/acm.2009.0044. PMID 20105062.
- Hayes M, Chase S (March 2010). "Prescribing yoga". Prim. Care 37 (1): 31–47. doi:10.1016/j.pop.2009.09.009. PMID 20188996.
- Alexander GK, Taylor AG, Innes KE, Kulbok P, Selfe TK (2008). "Contextualizing the effects of yoga therapy on diabetes management: a review of the social determinants of physical activity". Fam Community Health 31 (3): 228–39. doi:10.1097/01.FCH.0000324480.40459.20. PMC 2720829. PMID 18552604.
- Gooneratne NS (February 2008). "Complementary and alternative medicine for sleep disturbances in older adults". Clin. Geriatr. Med. 24 (1): 121–38, viii. doi:10.1016/j.cger.2007.08.002. PMC 2276624. PMID 18035236.
- Silverberg DS (September 1990). "Non-pharmacological treatment of hypertension". J Hypertens Suppl 8 (4): S21–6. PMID 2258779.
- Labarthe D, Ayala C (May 2002). "Nondrug interventions in hypertension prevention and control". Cardiol Clin 20 (2): 249–63. PMID 12119799.
- Vishnu-devananda, Swami (1959) The Complete Illustrated Book of Yoga
- Mittra, Dharma, (2003) Asanas: 608 Yoga Poses", ISBN 1-57731-402-6
- "Yoga.com". Yoga.com. 2005-02-27. Retrieved 2011-10-29.
- Yoga Journal, Talking Shop with Dharma MittraDharma Mittra - the master teacher behind the 908 yoga asana poster -shares his insight on the practice
- "US patent on yoga? Indian gurus fume". The Times of India. May 18, 2007. Retrieved 25 May 2010.
- "Indian Government in Knots Over U.S. Yoga Patents". ABC News. May 22, 2007.
- "GRANT OF PATENTS ON YOGA BY UNITED STATES PATENT AND TRADEMARK OFFICE – THE FACTUAL POSITION". PIB, Ministry of Commerce & Industry. June 13, 2007.
- "India Documents 900 Yoga Poses to Block Patents". Voice of America News. 11 Jun 2010.
- Nelson, Dean (23 Feb 2009). "India moves to patent yoga poses in bid to protect traditional knowledge". The Telegraph (London).
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