I ran 5/3/1 for a year and a half and made some really good gains on it, but stalled out eventually and grew tired of the same 'ol, same 'ol. It net me almost 400lbs total in the first year, but also some pretty major imbalances and weaknesses that assistance work alone just wasn’t addressing properly, so hence the switch to conjugate. I gained 10lbs in the first month and very little of that went to the waist. I am 6’5", normally sit at 330 and gain muscle mass with high volume really easily, so take that for what it’s worth. It’s honestly a relatively easy system to follow. Here’s a link that lays it out the easiest way to understand that I’ve came across. Good luck! The Westside Method Thread