As a personal trainer, I have to know exactly what is going on inside your body when you exercise, and Mr. Delavier gives readers a good perspective of the anatomic structures involved in strength training, but there are exercises in his book that shouldn't be there, like the front delt flyes and the upper row. In this exercises the shoulder is in internal rotation and when the arm is raised, the bursa and the tendons of the supraspinatous and long head of the bíceps, are pinched by the troquiter and the acromium, leading to tendinitis.
Exercises, like external rotation of the shoulder, for example aren't there. With books like this, I'm not amazed when I see a bodybuilder with a shoulder injury.
To learn about proper technique, take a look at Efective Strength Training by Douglas Brooks.