Reference – GST (i) – (iii) page 138, TaijiKinesis Vol 2.
We are back to the horizontal circling. Revisit it. Check that the circle is really a circle.
Now add in the principles of defence from GST (i) – (iii). Pay heed to the three lines of defence in turn.
Train this mental awareness until you have a refined sense of movement; of how much you need to move to defence against each of the three lines.
OK, done. Another simple basic.