This was completely worth the investment! Starting P90x, I had no idea how the nutrition plan fully worked. This book gave me the insight to how the portions work, as well as how to be on a budget while on this diet. All the recipes linked to in the book are delicious and easy to follow. I am positive that I will make it through the next 2 phases of P90x, now that this book has taught me how to plan out my weeks. Thanks, Carly!