is a comprehensive diet, exercise, and lifestyle logbook/journal to help you stay focused, accountable, and motivated to live Primally. The n=1 (an experiment of one) format allows you to dial in the exact foods, workout patterns, and supporting lifestyle behaviors you need to peak — with your physique, fitness goals, and everyday energy and immune function. The 90-Day Journal is the ideal practical guide to support Mark Sisson's best-selling and .  Unlike many rigidly structured workout logs and food diaries, this journal allows for plenty of creativity and free-form expression. Filled with detailed how-to-use instructions, experiment suggestions, and handy Primal resources, this journal is exactly what you need to launch your experiment of one!  Inside the 282 pages you'll find detailed, step-by-step instructions on how to conduct personal experiments and use the book to discover how your body works, and sample experiments for weight loss, improving sleep, moderating systemic inflammation and others to set you off in the right direction.  In addition, you'll discover a spacious, two-page daily journal spreads with assorted customization options for meal and workout particulars, subjective Success Scores (for daily energy, motivation, health and goal progress), and data from unique personal experiments that you design and track during your 90-day journey, as well as a handy Primal resource section covering all the key Primal Blueprint concepts, food and meal suggestions, workout guidelines, macronutrient values for common meals and snacks, and more.