Did Arnold do 5×5?

It’s well documented that Arnold Schwarzenegger built his foundation using Reg Park’s 5×5 routine which is almost identical to SS (Reg Park’s routine is comprised of 2 warm up sets+3 working sets=5×5).

How did Reg Park train?

Reg believed in spending time on exercises that produce the maximum return. The cornerstone of his training was a healthy diet of squats, deadlifts, and bench presses, which he called the primary strength exercises. Secondary or supplementary exercises were cleans, high pulls, and clean and presses.