Stress, tension and backache.
The author is a confident and influential writer, and states his philosophy and ideas that bodily movement (exercising) is imperative to our intelligence survival mechanism. His approach is considerate and polite. Without undue assumptions that everyone is "made the same". He is firm, yet polite and respectful to his reader(s). The only miss I have found is that the book presents cases of very young or middle age patients (clients). Between the ages 22 and 40, and doesn't include the older generation of men and women, someone in their early 60s or even 70s. And that is the loss for me, personally. Otherwise the book is excellent in quality of writing, human factor demonstrations and photos of exercises.
