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.