Years ago when I was a teenager, Nubret spent a week training in Toronto at the gym I trained at. He spent HOURS doing set after set after set after set of the same exercise (ie. single side laterals) with ridiculously light weights (ie. 70 pound barbell curl). I witnessed Bruce Page, a bodybuilding author and historian who wrote for Ironman, tape Nubrets arm after one of these marathon sessions at 21 1/4 " pumped. Zane never ever approached that size but had a much more complete package.