1964 "Muscles are his business", Ebony‎ (Dec.) 20 (2): 148Physique of powerful bodybuilder (below) is like piece of sculpture. Buffs strive for the well-rounded body, disdain the professional weightlifter, who merely develops a number of very specialized muscles.
1974 — Charles Gaines & George Butler, Pumping Iron: The Art and Sport of Bodybuilding, ch 2Because it is necessary for a muscle to rest while it grows and because of the importance of balanced development, most competitive bodybuilders train on a split routine; they work certain parts of the body one day and rest those muscles the next while they work the others, alternating like that six days a week.
1991 — Samuel Wilson Fussell, Muscle: Confessions of an Unlikely Bodybuilder, ch 4In the competitions, bodybuilders go through "mandatories"—a set of mandatory poses—in the morning, where the judges compare the body parts of the builders.
