An asana is a body posture, originally and still a general term for a sitting meditation pose, and later extended in hatha yoga and modern yoga as exercise, to any type of position, adding reclining, standing, inverted, twisting, and balancing poses. The Yoga Sutras of Patanjali define "asana" as "[a position that] is steady and comfortable".  Patanjali mentions the ability to sit for extended periods as one of the eight limbs of his system. Asanas are also called yoga poses or yoga postures in English.

 

Asanas were claimed to provide both spiritual and physical benefits in medieval hatha yoga texts. More recently, studies have provided evidence that they improve flexibility, strength, and balance; to reduce stress and conditions related to it; and specifically to alleviate some diseases such as asthma and diabetes.

 

Asanas have appeared in culture for many centuries. Religious Indian art depicts figures of the Buddha, Jain tirthankaras, and Shiva in lotus position and other meditation seats, and in the "royal ease" position, lalitasana. With the popularity of yoga as exercise, asanas feature commonly in novels and films, and sometimes also in advertising.

 

Asanas originated in India. In his Yoga Sutras, Patanjali (c. 2nd to 4th century CE) describes asana practice as the third of the eight limbs (Sanskrit: अष्टाङ्ग, aṣṭāṅga, from अष्ट् aṣṭ, eight, and अङ्ग aṅga, limb) of classical, or raja yoga. The word asana, in use in English since the 19th century, is from Sanskrit: आसन āsana "sitting down" (from आस् ās "to sit down"), a sitting posture, a meditation seat.

 

The eight limbs are, in order, the yamas (codes of social conduct), niyamas (self-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, ultimate reality). Asanas, along with the breathing exercises of pranayama, are the physical movements of hatha yoga and of modern yoga. Patanjali describes asanas as a "steady and comfortable posture", referring to the seated postures used for pranayama and for meditation, where meditation is the path to samadhi, transpersonal self-realization.