The self proclaimed "Trainer of champions since 1936" (he would have been 17 years old at the time). Joe Weider was a Canadian entrepreneur who, with his brother Ben, founded the international federation of bodybuilders as well as magazine publishing empire starting in 1940 with Your Physique (later Muscle Builder and Muscle & Fitness). Other well known Weider titles included; Mr America, Muscle Power, Men's Fitness, Shape, and Flex.
Weider published a number of courses during his lifetime. His system of bodybuilding was one of the first "courses" I purchased, coming with six wall charts of exercises, a book, and three anatomy wall charts it certainly looks the part. Here is an early progressive dumbbell training course. It's quite interesting as it includes photo of Joe himself demonstrating at least one of the exercises (His bodybuilding system is posed by his "champions").