Arnold provides insight into how he developed his incredible chest. He outlines his chest / back routine split in this excellent article.Source: Muscle Builder Power (July 1973) Page #24 - Muscle Builder Power (July 1973) Page #25 - Muscle Builder Power (July 1973) Page #26 - Muscle Builder Power (July 1973) Page #27 - Muscle Builder Power (July 1973) Page #28 - Muscle Builder Power (July 1973) Page #29 - Muscle Builder Power (July 1973) Page #77 - Muscle Builder Power (July 1973) Page #78 - Muscle Builder Power (July 1973) Page #79 - Muscle Builder Power (July 1973)