I use an arbitrary number like

Still can't quite figure out which muscle it is? It is the part of your large back muscle where it passes overyour right kidney area. At least you will feel more tensionat this spot of your back muscle. Your back muscle is very powerful --- when it is stretched outand then tightened aggressively. The effort needed by this muscleto draw your right shoulder backwards is not very much. In mylessons, I use an arbitrary number like one twentieth of itspower. This is the only conscious movement you need to do the "onepiece takeaway". In the pictures and videos on my website you can see how myupper body responds to the one movement described above. The One-Piece Takeaway Movement — In Posture