Short Answer:

The most effective, AND, there is much more in this easy to read and understand e-book!

The Truth About Abs is about the way the body, your the truth about abs body, works and uses the fuel that you give it.  What and why we put certain things in our bodies is a subject of the book in a very big way.  The what and the why is explained, in great detail, and then Mike Geary, the author of this most popular weight loss and abs developing book and program, provides all of the answers about the proper nutrition that should be one of your first goals in developing the abs that you already have into what you want them to be.

The exercises that are explained in the book have been designed by Mike, a Certified Nutritionist and Personal Trainer, are those that were mentioned earlier and they are those that involve the very intense, yet short, exercises that will work all of your muscles at one time and leave you feeling like you have actually done something!