If Autogenic Training is working with the mind (suggestion), then Edmund Jacobson's Progressive Relaxation is pure work with the body. This method, developed in the 1920s, is based on a simple premise: the mind cannot be restless if the body is relaxed. It is physiologically impossible.
Mechanism: Tense and Release
Many people live in a state of chronic muscle tension that they don't even notice (e.g., clenched jaws, raised shoulders). Jacobson discovered that to relax a muscle, you first need to... tense it very strongly. Only the contrast between extreme tension and sudden relaxation allows the brain to "notice" the difference and release the blockage.
Scientific Sources:
- Jacobson, E. (1938). "Progressive Relaxation". University of Chicago Press.