Primal Blueprint author Mark Sisson presents a fun, easy-to-follow, practical guidebook to help you 'get Primal' in only 21 days. First, you'll learn eight Key Concepts that represent the most important day-to-day elements living Primally, then tackle five Action Items that will enable you to literally reprogram your genes toward a long, healthy, and energetic life. The Action Items are presented in a fun and life-transforming 21-Day Challenge, featuring daily diet, exercise, and lifestyle endeavors with corresponding journal exercises. You'll transition out of the regimented, carb-dependent, fat-storing Standard American Diet (SAD), the chronic, overly-stressful exercise patterns recommended by Conventional Wisdom, and other health-compromising elements of hectic modern life. Instead, you'll smoothly implement the evolution-tested lifestyle behaviors of our hunter-gatherer ancestors to promote optimal gene expression. By eating Primally, you'll transform from a 'sugar-burner' into a Sisson's so-called 'fat burning beast', where stored body fat becomes your preferred fuel choice, and energy, hormone, metabolic, and immune function are optimized automatically. With an intuitive mix of Primal workouts, you'll get exceptionally fit in only a few hours per week - and have fun while you're at it...