“The state of Dhyānam is possible in a seated posture.
If a person lies down, it may induce sleep.
If a person walks and moves about,
he may be distracted by the objects around him.
This posture must be in a place
where the mind will not be distracted.”
– T Krishnamacharya commentary on Yoga Sūtra Chapter Three verse 2

– TKV Desikachar Yoga Sūtra Study Quotes Collected and Collated
– T Krishnamacharya Yoga Sūtra Study Quotes Collected and Collated