Senses seek jnana (knowledge) in pratyahara.
Yogic jnanendriyas seek knowledge of the Self—true jnana.
Silent sound forms of prana kriya cast a spell on pranic system to open chest.
Classical Yoga serves the three “spiritual” dimensions of embodiment—adhibhautika (five elements within), adhidaivika (inner celestial forces), and adhyatmika (Self).
Viparita Karani is not just an anti-anxiety pose, but an act of meditation, dhyana… the key practice that leads to samadhi.