In yoga, asana refers both to the place in which a practitioner (yogi if male, yogini if female) sits and the posture in which he or she sits. In the Yoga Sutras, Patanjali defines "asana" as "to be seated in a position that is firm, but relaxed". Patanjali mentions the ability to sit for extended periods as one of the eight limbs of his system, known as ashtanga yoga.
Asanas are also performed as physical exercise where they are sometimes referred to as "yoga postures" or "yoga positions". Some asanas are arguably performed by many practitioners just for health purposes. Asanas do promote good health, although in different ways compared to physical exercises, "placing the physical body in positions that cultivate also awareness, relaxation and concentration".
Asana (/ˈɑːsənə/; listen Sanskrit: आसन āsana [ˈɑːsənə] 'sitting down', < आस ās 'to sit down') originally meant a sitting position. The word asana in Sanskrit does appear in many contexts denoting a static physical position, although traditional usage is specific to the practice of yoga. Traditional usage defines asana as both singular and plural. In English, plural for asana is defined as asanas. In addition, English usage within the context of yoga practice sometimes specifies yogasana or yoga asana, particularly with regard to the system of the Ashtanga Vinyasa Yoga. However, yogasana is also the name of a particular posture that is not specifically associated with the Vinyasa system, and that while "ashtanga" (small 'a') refers to the eight limbs of Yoga delineated below, Ashtanga (capital 'A') refers to the specific system of Yoga developed by Sri Krishnamacharya at the Mysore Palace.