Arnold Schwarzenegger was on top of the bodybuilding world by 1972. What was his secret? Read and find out.Source: Muscle Builder / Power (Issue Feb 1972) Page 25 (Muscle Builder / Power Issue Feb 1972) Page 26 (Muscle Builder / Power Issue Feb 1972) Page 76 (Muscle Builder / Power Issue Feb 1972) Page 77 (Muscle Builder / Power Issue Feb 1972)