I started running regularly when I was 19 years old, over 30 years ago. In the beginning I ran to lose weight, but I continued to run throughout the years to maintain my weight. After all those years, last year for the first time I suffered a running injury and had to reduce my running drastically (but I didn't stop altogether) to heal. My achilles tendon was hurt. I found out that I wasn't immune to injury, after all. I'm not going to say that if I had read this book beforehand I would not have been injured, but I probably would have been smarter about training and I would have known better what to do to heal after the injury occurred.
This book gives an introduction in injuries, compared to just typical aches and pains. It covers in great detail methods to prevent injuries, and then it provides information on how to treat them when they occur. It offers several different exercises for cross-training than can also help you to avoid running injuries, and it has chapters specifically for certain people and how they might be different. By different, I mean it has a chapter dedicted to children and another dedicated to women, and another dedicated to older runners. I think that last one should be very helpful to me as I approach retirement age.
I found this to be a very interesting read and I intend to keep it for reference. Barrios has done an excellent job covering this subject.