I got that book and I haven’t had much luck with it. I can’t really feel those muscles or tell what I’m doing with them most of the time, and sometimes I just clench up for awhile and can’t relax them. I’ve had more benefits just using dilators, because then I can actually feel what’s happening – whether I’m fighting the dilator or relaxing. I don’t know if it’s just me (I’m autistic and often experience sensory sensations differently) or if most women have trouble with those exercises.