My background -- I have been into Interval Training for a while and took up HIIT as part of natural progression. I undertsand the basics of it and it has helped me improve on multiple fronts. My review is based on my current level of HIIT expertise and knowledge hence.
For a beginner this is a great book. The concept is explained clearly, the comparison between HIIT and CT (Continuous training) is done very well along with differences and benefits.
It also talks about how HIIT helps with burning more fat then CT and the science behind it. Various forms of HIIT, nutrition related aspects, various HIIT workouts, stretches and common pitfalls are also indicated very well.
My only concern is that it doesnt go too deep into the science beind how human body burns fat and the associated details (Ex: ATP energy source information is limited, ATP converting to ADP, using creatine supplement to replenish ATP stores quickly and even storing more of it to improve performance etc is not touched).
In all honesty i don't think the author wanted to go too deep into those aspects as well since this is targeted twards beginners.
Recommended.