Reiki practice is extremely passive. The Reiki Practitioner's hands are still for most of the treatment, moving only to change hand placements. The Reiki practitioner is neutral, making no attempt to fix the recipient or to change the biofield. Additionally, the practitioner does not in any way control Reiki energy. She/he merely rests their hands lightly on the body (or just above the body). Reiki energy in the practitioner's hands arises spontaneously in response to the individual recipient's need for balance at that particular time. In this way, each Reiki treatment is automatically customized to the immediate need of that particular recipient, even though the practitioner may use the same sequence of hand placements for each treatment. Reiki is a complementary and alternative medicine practice that uses putative energy fields or biofield's, to affect health. The multileveled, rapid response to Reiki suggests a complex process that engages many body systems, simultaneously or in quick succession, shifting the body from domination by the "fight or flight" (stress) response to the relaxation response, and supporting the body's own healing mechanisms.