Both an exercise program and a reference manual with a ground-breaking new treatise on bodybuilding and strength training.
There's so much insights in this book. I found myself highlighting almost the entire book because there's so much useful information that can be readily applied. One example is when Mr. Poliquin talks about the benefits of tempo in a lift and how it can produce different results depending on how long it takes to complete the two.
He gives endless examples of workouts. That by itself is enough.