So I’ve been training for a few years now (seriously, always been fit And lifted, marine veteran). Natural at first then geared up after getting out of the marines. I always trained 7-10 rep range. Training heavy. I peaked at around 215 (I’m 5’10). I was big and strong but I wasn’t very full. My muscle bellies weren’t very rounded. My BF wasn’t competition level but I was around 12% at my biggest. My question is this. Rich piana (yea that dead synthol guy) and Arnold both suggested lifting for the pump. Higher rep ranges till it burns and then keep going. I did this for a week during my chest workouts and it seems to be putting some fullness to my chest. Is this the way to go for bodybuilding? Does this actually build muscle or just give volume to the muscle you already have like a pump? I don’t care how much weight I lift. I’m trying to compete. Looks only Thank you in advance. All advice is welcomed.