Were anatomy looks at muscles and bones and how they connect, biomechanics looks at how those muscles and bones interact in a live body, in your body.
Learning muscle control and proprioception, you can directly experience the biomechanical forces within your own body, and so gain an even better understanding of how your body works. You can experience your own anatomy.
controlling tension in the IT Band
(How it helps to stabilize the Hip)
(Lifting the back ribs to improve ribcage awareness and control)
It supports the back of the torso in Twisting actions.
As a yoga teacher, I'm constantly exploring new exercises, new ways of doing yoga poses.
There is no single "right way" of doing a yoga pose. Instead, there are options. And the better you are at "feeling" your body, the better you can get at choosing the right option for your body as it is now.
For any technique, the point of practice is to learn feel it and to control it, so that it can be used without thinking about how to use it.
And that is more or less the approach taken in all of my ebooks and videos. They help you to feel your body and control it so that you can work towards using it effectively in anything that you do.