 The pose is not found in the medieval hatha yoga texts.It is described independently in Swami Vishnudevananda's 1960 "Complete Illustrated Book of Yoga" in the Sivananda Yoga tradition, and by "B. K. S. Iyengar" in his 1966 "Light on Yoga", implying that it may have older origins.A similar pose was found in Western gymnastics such as in "The Bagot Stack Stretch-and-Swing System", 1931, though Bagot had visited India.