Objectives: To investigate whether Holotropic Breathwork (HB) has any significance in the development of self-awareness. Design: A quasi-experiment design and multiple-case studies. A single case design was replicated. The statistical design was a related, within subject and repeated measures design. A Pre-During-Post design. Subjects: The subjects (n=20) were referred from Danish HB-facilitators. Nine subjects were novices, and eleven had previous experience of HB.