Wernbom M, Augustsson J, Thome\u00e9 R. The influence of frequency, intensity, volume and mode of strength training on whole muscle cross-sectional area in humans. Sports Med. 2007;37(3):225-64. doi: 10.2165\/00007256-200737030-00004. PMID: 17326698.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"The classic upper-lower split workout routine is a time-tested approach that strikes a perfect balance between intensity and recovery. Loved by athletes, powerlifters, and fitness fans alike, the upper-lower split is a versatile workout routine that perfectly complements resistance training principles. 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