Both an exercise program and a reference manual with a ground-breaking new treatise on bodybuilding and strength training.
Besides that advanced information--packaged here for serious bodybuilders-- Poliquin peppers his book with darkly funny jabs at the muscle world's reigning brain trust. He pokes fun at one famously unstable guru's obsession with Ayn Rand, and points out that much of the training information in bodybuilding magazines is really created by editors and writers for those magazines, since the bodybuilders themselves rarely bother to tell the truth about what they do in the gym (and the drugs they use outside of it).
The Poliquin Principles is a rarity in the muscle world: a serious training manual that's also a lot of fun to read. --Lou Schuler