The buddha is your real body, your original mind.
This mind has no form or characteristics, no cause or effect, no tendons or bones.
It's like space. You can't hold it.
All motion is the mind's motion. Motion is its function. Apart from motion, there's no mind.
Apart from the mind, there's no motion. Even so, the mind neither moves nor functions.
Because the essence of its function is emptiness. And emptiness is essentially motionless.