It is a good book, worth reading yourself. Great information. All but a few of the “exercises” are done together.
It is basically like tantric sex, but without all the philosophical trappings. To make a long story short you learn how to keep each other on the edge of orgasm for a long while. Relaxation techniques so both of you are in the moment and not thinking about other stuff. The early bedroom exercises have you concentrating on her for 30 minutes, then she concentrates on you for 30 minutes - basically training each other on how to “edge” the other person. (Great technique descriptions/ideas discussion by the way.) Then you start building on that.
That is definitely simplified. But it is a lot of fun.
We found that we got a lot of emotional closeness out of it too.
I can’t find that kegel article but I will keep looking.