Casey Viator in his best shape ever was the 1982 Olympia. According to David Young who trained in the same gym with him he was using around 15 sets a body part. Pure volume is how he trained for that Olympia. Young has since died but he use to write for Iron Man and also posted here under an alias. Mentzer use to train with Viator until Viator went the volume route. Again, his best shape ever was the 1982 Olympia and he was using volume. He was ripped like never before and big.