In this compact guide, personal trainer and coach Jens Sprengel explains the most important aspects of designing an effective training program for building maximum muscle mass naturally. He combines the latest and most current research findings from exercise science with the empirical experiences of successful strength athletes from past generations. This book provides the fundamentals for creating countless training programs tailored to different body types and neurotransmitter profiles, taking into account individual differences and similarities regarding neuro-endocrine stimulus-response mechanisms and the ability to adapt to resistance training. Topics covered include muscle building as a natural biological special program of human evolution, stimulus-response mechanisms, and the law of adaptation.