it's all about shocking the body into growing. I'm 6'2" and 220 lbs. BF% is about 12%. I cannot flat bench more than 200lbs. and even to lift that much...I need to be spotted. There are MANY guys in my gym lifting 250+ on flat bench whom I would say are small and have no real chest development. Sure..they lift heavy, but, they don't look like they can, they do the same excercises in the same order week after week, they're strong, yet, they appear small. I never do the same routine twice. So, I never really get strong on a movement, but, I still get big. I can barely curl 70 pounds...but my arms are 19 inches. It's not how much you lift..it's how you lift it. I rarely ever go below 6 reps. I keep my reps between 12-15. I don't care how much I can lift..I just wanna get big.