Holotropic Breathwork is an important tool for the training of peace workers because it decisively improves their personal competences. In this chapter, this form of intense process-work, drawn out in its practice-relevant basic principles, becomes part of the range of methods from the realm of transpersonal psychology. It allows deeper access to suppressed biographical problems, not yet integrated experiences related to the own birth, as well as to the transpersonal and mystic aspects of being. Potentials for self-healing are mobilized, blockages in the own life reduced and deep insights into the own path become accessible. The concept of "inner wisdom" that is a crucial aspect of holotropic breathwork is explained through the link to personal and transpersonal theories of the self.