Originally Asana meant to sit down or sitting down. 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, the only rule Patanjali suggests for practicing asana is that it be “steady and comfortable”. (Wikipedia)
Generally a Asana refers to practicing physical poses.
Magdalaya Yoga 