Thanks for the question ajanta,
Sometimes I have my son and Bob the Builder going in the background of an impromptu session of Moving of Yin & Yang and still get a lot of benefit. Just think of how much more benefit your getting doing it to the 6-word healing chant!
You may be aware of blockages through a change in physical sensation during your exercises. A lot of times the "weakest link," a blockage, or place you hold energy when stressed can make itself know while doing the exercise.
If you need to move on, that is okay. Chunyi has responded to people that it is a wonderful opportunity to stay with the exercise and release the energy blockage.
Much Love, Shawn