I have this book: Kum Nye Relaxation: Theory, Preparation, Massage. Which one do you have?
I haven't done any of the excercises, but did read several chapters. A lot of stuff corresponds to what I experienced in samatha meditation. I like that he (tarthang tulku, the author) mentions 'widening' (feelings/sensations) a lot, as my meditation experience also includes a lot of 'widening'. Eg, when I'm working (as a driver), at best, I widen my attention and then let breath energy circulate. I haven't got a very strong handle on it though. Oftentimes other sensations get in the way (eg feeling nauseous).
Do you still need to do the excercises or can you do without? Is your experience anything like mine? like I described above?