My name is ryan and I've only been lifting for a couple months now. I started out small and am still quite small (160, but a fair amount of that is fat) though doing the wannabebig routine has helped me quite a bit. I've been reading posts here for about a month, and they've helped too. My question is about high intensity training, which it seems everyone here swears by. Is it right for beginners as well as seasoned lifters? I hope this isn't a sensitive, run into the ground point, if it is I apologize. It's been working for me, but then a couple nights ago I was in a shop that sold lifting supplements (not a big chain with a 16 year old behind the counter, but one with a big guy been lifting for 15 years, owns a gym too).
Almost everything he told me agreed to the letter with what I've been reading here (squats good, glutamine good etc.) but he said that 6 - 8 reps of heavy weight is bad for a beginner, that I should be doing 12 - 15 for at least 6 months to a year before doing less reps, and that I should not go to failure. He said I risk injury and improper development otherwise. I love high intensity but I really don't want to risk it. Is there truth in what he said?