Today when I lay down in shavasana my body feels sucked into the ground and prana moves fast and hard through my body in a swirling vortex movement. It feels like a strong vibration whirling around the body- as if the whole body feels dizzy. Brahma Shakti (energy of creation) whirling through fascia, blood, muscle.
Each asana *begins* with the physical posture. But what makes a yoga posture different from say an exercise posture is that asana is designed to change your inner state. Each asana is specifically designed to bring about specific internal state(s).
The invitation of corpse pose is to die to your current state to allow new creative energy to flood the body-mind-being, unrestricted by thought or activity. Thought and activity require you to focus attention. When we focus we direct prana to the object of our attention – it’s a narrowing or gathering of energy. In corpse pose we release and relax. We diffuse our attention so that prana rejuvenates the body.