The author Lucien Sina is a licensed fitness trainer and has been intensively involved in bodybuilding, training theory, and nutritional strategies for over 20 years. During this time, he has built up in-depth knowledge of muscle building, targeted fat loss, functional mobility, and strength development-both through his own experience and through continuous further training. His training philosophy combines scientifically sound approaches with tried-and-tested methods to promote sustainable physical development and holistic fitness. In his book, he conveys his comprehensive know-how in a compact, understandable, and directly applicable way.