Commentary
The Lord tells that the meditator should firmly hold his body in such a way that his vertebral column is completely erect – the head, neck and the spinal column should be vertical to the horizontal seat. Holding the body firmly means that it should not be moved in any direction although it has to be kept relaxed.
Patanjali points out that the posture should be steady and pleasing so as to aid concentration. A right posture gives serenity of body. The body must be kept clean if the living image of God is to be installed in it.
His gaze should be fixed at the tip of his nose. If this is followed literally there is a possibility of the seeker getting headache, giddiness etc. Adi Sankara says that the term means that the meditator should have his attention as though turned towards the tip of his own nose. The meditator is advised not to look around so that his attention may not get distracted.
Swami Chinmayananda
Swami Chinmayananda Commentary
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Adi Sankara Commentary
See Commentary under 6.14
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Srimad Bhagavad Gita Chapter 6 – Verse 13 – 6.13 samam kayasirogrivam – All Bhagavad Gita (Geeta) Verses in Sanskrit, English, Transliteration, Word Meaning, Translation, Audio, Shankara Bhashya, Adi Sankaracharya Commentary and Links to Videos by Swami Chinmayananda and others – 13-Jun

