It is certainly possible to have an out-of-body experience in a Holotropic Breathwork session. Most Holotropic Breathwork sessions, however, are exceptionally embodied. In fact, this may be one of the most valuable aspects of Holotropic Breathwork. Because the breather is lying down, on a mat, with someone nearby to ensure that he won’t get hurt, it is possible for his body to do whatever it needs to do. This is quite a different injunction, for example, than in a meditation retreat, where the exact physical posture for practice may be prescribed.
In a Holotropic Breathwork workshop you can express yourself physically in just about any way imaginable. More to the point, you can allow your unconscious to express itself physically, in any way it wants to. Thus participants can have fully embodied spiritual experiences, quite idiosyncratically expressed. I have seen no practice that marries the transcendent and the immanent, or the spiritual and the physical, so effectively.