About the book: 2018 / With most training plans geared toward men, it's no wonder so many female athletes struggle to achieve their maximum potential. The Relentless Workout for the Determined is a comprehensive, physiology-based nutrition and training guide specifically designed for active women. This book will teach you everything you need to know to tailor your nutrition, hydration, and your unique physiology so you can work for your body rather than against it. Exercise Science Scientist Stacey Sims, Ph.D., shows how to become your own bio-curator for optimal athletic performance..