As an FYI only…
From a look in through the classical Yoga perspective it is not at all about stretching and fluid movement. Factually speaking none of the great yogis of the past did any asana at all. Asana was frowned upon as an ego pursuit and was not entertained, it was shunned.
Even a look at the Sutras indicates there isn’t anything about yoga that remotely indicates stretching and movement. There’s only one sutra that mentions asana at all and that sutra, depending on ones interpretation indicates one should be still, not move.
If one applys the ashtanga path of Patanjali the purpose of asana is to prepare the body for pranayama. Pranayama is to facilitate sense withdrawl or praatyahara. This alllows the practitioner to focus the awareness (Dharana) and so on.
