Inverted back-bending posture in hatha yoga
Setu Bandha Sarvāṅgāsana (Sanskrit: सेतु बन्ध सर्वाङ्गासन), Shoulder supported bridge or simply Bridge, also called Setu Bandhāsana, is an inverted back-bending asana in hatha yoga and modern yoga as exercise.
Etymology and origins.
The pose is named from the Sanskrit words सेतु "Setu", a bridge; बन्ध "Bandha", caught; सर्वा "Sarva", all; ङ्ग "Anga", limb; and आसन "Asana", seat or posture. 
The pose appears as "Kāmapīṭhāsana" in the 19th century "Sritattvanidhi" (written before 1868).
Description.
The pose is entered from Sarvangasana (shoulderstand), the chest being held forwards by the hands and the feet lowered to the ground behind the back, the knees remaining bent; or more easily, by lifting the back from lying supine on the ground. The full pose has the knees bent and the ankles caught ("Bandha") by the hands. The pose may be exited either by lying down or by jumping back up into shoulderstand.
Variations.
A common form of the pose has the arms straight out along the ground towards the feet, the arms straight with the fingers interlocked. Some practitioners are able to straighten the legs in the pose.
Eka Pada Setu Bandha Sarvangasana (One-legged Bridge) has one leg raised vertically.
References.
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