“When you cannot hold the body still, you cannot hold the brain still. If you do not know the silence of the body, you cannot understand the silence of the mind. Action and silence have to go together. If there is silence, there can be conscious action and not just motion. When action and silence combine like the two plates of a car’s clutch, it means intelligence is in gear.
While doing the posture your mind should be in an interior conscious state that does not mean sleep; it means silence, emptiness, space that can then be filled with an acute awareness of the sensations given by the posture. You watch yourself from the inside. It is a full silence.” BKS Iyengar, “ Light on Life” p. 32.
Eka Pāda Viparīta Dandāsana — one legged inverted staff pose with support.