Humans recognize two forms of breathing: active inhalation and passive exhalation, or passive inhalation and active exhalation. The form of breathing influences posture, wakefulness and sleep rhythms, as well as which senses are favored. It significantly affects metabolism. This book not only describes the forms of breathing scientifically but also contains around 100 exercises and experiments that allow readers to experience the concepts firsthand. You may know whether you are right- or left-handed, but do you also know if you are an inhaler or an exhaler? Most people are unaware that their own breathing form is crucial to their life, perception, and body. This is the first work that makes human breathing forms scientifically comprehensible and physically experiential. It provides a plausible biological explanation for right- and left-handedness, as well as different daily activities, and describes the physical factors that enable breathing life. More than a hundred perception exercises allow for an intense and direct personal experience of the theory.