Based on scientific evidence and practical expe-rience, this work by Jackson Gervasio Pires offers a critical analysis of nutrition and supplementa-tion strategies to improve athletic performan-ce, with a special emphasis on the disciplines of Hyrox and CrossFit. The author objectively demonstrates how well-planned nutritional strategies can account for up to 30 % of athletic performance, while providing evi-dence-based analysis on the use of dietary supple-ments, demystifying common beliefs and practices in the field of sports. Published by Sportraining, this book is a valuable resource for athletes, coaches, and health professionals seeking to improve athletic performance through evidence-based nutritional interventions.