Biomechanics is the science of the laws of mechanical movement in living systems. The purpose of the book “Osteopath's Handbook” is to reveal the nature of the human body and its mechanisms in both mobility and stability, with a detailed analysis of the joint structure and muscle function. The main part of this publication is the section of biomechanics, in which the body is considered as a system of bone levers. Through the study of biomechanics, it is possible to understand the physical principles that control the body and the forces acting on it, which will help to come closer to understanding the structure and function of its individual components. For osteopaths and doctors of any specialty interested in biomechanics and the relationships between structure and function: orthopedists, traumatologists, chiropractors therapists, neurologists and physical rehabilitation specialists, as well as for all those interested in body-oriented practices.