In the Bhaddekaratta Sutta, the Buddha taught, "Looking deeply at life as it is in the very here and now, the practitioner dwells in stability and freedom," a teaching that echoes Patanjali's definition of asana (yoga postures) as "stable and easeful". In both the Anapanasati Sutta (Awareness of Breathing) and the Satipatthana Sutta (Foundations of Mindfulness), the Buddha tells us to observe the breath and then extend our awareness out to include the whole body. He say that the practitioner should be aware of the movements and position of the body, "bending down, or standing, walking, sitting, or lying down."

--from Breath and the Body by Frank Jude Boccio