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Interesting… he tended to use 2-3 sets for most body parts and had one training day of doing whatever he wanted to. A shame he never wrote a book.
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He did. It was called “Intensity for Immensity.”
or in this interview, he said he did 3 way split, 5-7 sets per muscle
RAY MENTZER: HIGH-INTENSITY TRAINING THE RAY MENTZER WAY - YouTube
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