Douglas Bernstein, who pioneered an early version of abbreviated progressive relaxation training, and his colleagues note, "progressive relaxation training is not a single method but a group of techniques that vary considerably in procedural detail, complexity, and length." What do these techniques have in common?

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The Answer of Douglas Bernstein, who pioneered an early version of abbreviated progressive relaxation training, and his colleagues note, "progressive relaxation training is not a single method but a group of techniques that vary considerably in procedural detail, complexity, and length." What do these techniques have in common?

Douglas Bernstein, Who Pioneered an Early Version of Abbreviated Progressive