Who first came up with progressive muscle relaxation (PMR)?
The technique of progressive muscle relaxation was described by Edmund Jacobson in the 1930s and is based upon his premise that mental calmness is a natural result of physical relaxation. Progressive muscle relaxation can be learned by nearly anyone and requires only 10 minutes to 20 minutes per day to practice.
From: Progressive Muscle Relaxation for Stress and Insomnia WebMD Medical Reference
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