[1] A variant with one leg held up is Vyaghrasana (Sanskrit: व्याघ्रासन; IAST: vyaghrāsana), Tiger Pose; a similar variant with one leg held straight out is Chakravakasana (Sanskrit: चक्रवाकासन; IAST: cakravākāsana), Sunbird Pose.A variant with the back lowered is Bitilasana (Sanskrit: बितिलासन; IAST: bitilāsana), Cow Pose; this is often used as the counter-posture, and a widely used exercise is to alternate between Cat and Cow Poses repeatedly.[2] The alternative name Marjariasana (also written Marjaryasana), मार्जरीआसन, is similarly from मार्जरी, mārjārī, also meaning "cat".[5] A different asana, Marjarottanasana, meaning upside-down cat stretch pose, is illustrated in the 19th century Sritattvanidhi.[7] The practitioner kneels on all fours and slowly raises and lowers the back, transitioning in a gentle vinyasa between Cat and Cow Poses, and exercising the core muscles that support the spine.