I'm halfway through it. Strozzi-Heckler is a well known Aikidoka (I don't know what his rank is), and was pivotal in the establishment of Aikido here in the bay area. He is known for his association with George Leonard and Wendy Palmer to develop transpersonal psychology related understanding. Something like that.
The book basically talks about everything is related to the Soma (or Body), and there is a relationship between somatic psychology going back to one of Freud's colleagues. The idea is that much of psychological trauma/conflict/neurosis becomes trapped in the body. The feeling of knots in your stomach, tension in the shoulders, knots in the chest, etc., those are all related to emotional stress as somatic symptoms. The book's talking mostly about the what and why (no so much how yet) about understanding or unblocking these symptoms which then leads to a release from those emotional conflicts. I guess you can say it's going at psychotherapy from a different direction: address the body and it will address the spirit, rather than regular psychotherapy which is the inverse?
Having done a little bit and gotten coached, many of the exercises involve breathing and experimenting with creating tension in the body (through the tightening and relaxation of muscles), and then developing a body awareness to sense tension. The book briefly touches on this stuff but hasn't gone in depth yet. The goal is to allow the body to related to the rest of the world naturally and without conflict. Doing so also leads to more buddhist-like ideas that everything is interconnected and understanding suffering.