The two key requirements for any training resource are that (a) the methodology is effective and that (b) it is explained in such a way that the user can implement it effectively, and this book comes up trumps on both counts.
The methods are clearly explained with just the right amount of science, enough to understand the process, but never the less aimed at a practical user rather than a medical audience. All the stretches are also clearly illustrated with good quality photographs ensuring correct implementation.
The only proviso I would make is that the protocols required to achieve results require both mental toughness and pain tolerance, which should not be a problem for those serious about improving performance in their chosen activities, but for those simply seeking increased mobility in everday life I would recommend 'Super Joints' by the same author as an alternative.