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Ardha Matsyendrasana (Sanskrit: अर्धमत्स्येन्द्रासन; IAST: Ardha Matsyendrāsana), Half Lord of the Fishes Pose,[http:<ref name="Half Lord of the Fishes Pose"//ayurwiki>.org/Ayurwiki/Ardha_Matsyendrasana#cite_note-1] Half Spinal Twist Pose <ref name="Half Spinal Twist"/> or Vakrasana <ref name="Vakrasana - Twisted Pose" /> is an asana. The asana usually appears as a seated spinal twist with many variations, and is one of the twelve basic asanas in many systems of Hatha Yoga.<ref name="Ardha-Matsyendrasana" />

The asana is named after the great yogi Matsyendranath.<ref name="Ashtanga Yoga " />

The name comes from the Sanskrit words ardha meaning "half", matsya meaning "fish", eendra meaning "king", and asana (आसन ) meaning "posture" or "seat".<ref name="Anatomy for Backbends and Twists" />

<references><refname="Half Lord of the Fishes Pose"> [http://www.yogajournal.com/pose/half-lord-of-the-fishes-pose "Half Lord of the Fishes Pose"]. Retrieved 2011-04-09.</ref><refname="Half Spinal Twist"> [http://www.yogapoint.com/asana/matsyendrasana.html "Yoga poses, Ardha Matsyendrasana, Half Spinal Twist:"]. Retrieved 2011-04-09.</ref><refname="Vakrasana - Twisted Pose"> [http://yoga108.org/pages/show/107-ardha-matsyendrasana-the-half-spinal-twist-yoga-posture "Vakrasana - Twisted Pose"]. Hatha Yoga. Advaita Yoga Ashrama. Retrieved 6 May 2013.</ref><refname="Ardha-Matsyendrasana"> [http://yoga108.org/pages/show/107-ardha-matsyendrasana-the-half-spinal-twist-yoga-posture "The Half Spinal Twist - Ardha-Matsyendrasana"]. Hatha Yoga. Advaita Yoga Ashrama. Retrieved 6 May 2013.</ref><refname="Ashtanga Yoga"> Maehle, Gregor; Gauci, Monica (November 2009).[https://books.google.com/books?id=OhYeGdNK0UoC&pg=PA43 Ashtanga Yoga - The Intermediate Series: Mythology, Anatomy, and Practice] .New World Library. p. 43.[https://en.wikipedia.org/wiki/International_Standard_Book_Number ISBN ] [https://en.wikipedia.org/wiki/Special:BookSources/978-1-57731-669-5 978-1-57731-669-5]. Retrieved 9 April 2011.</ref><refname="Anatomy for Backbends and Twists">Long, Ray (22 January 2011). [https://books.google.com/books?id=iGTIdmn6RgsC&pg=PA162 Yoga Mat Companion 3: Anatomy for Backbends and Twists]. Greenleaf Book (Distributor). p. 162. [https://en.wikipedia.org/wiki/International_Standard_Book_Number ISBN] [https://en.wikipedia.org/wiki/Special:BookSources/978-1-60743-944-8 978-1-60743-944-8]. Retrieved 9 April 2011.</ref> </references>