3 exercises caused injury to me, squat, deadlift and flat bench. I'm not a pro or want to be, just built, lean, and healthy. I worked out for close to 20 years. The body at maximum advantage, rest, nutrition, training, can gain only 1-2 pound muscle every two weeks, without fat, from my experience and reading. Getting big fast with those exercises, is going to get to you getting the big hurt fast, like a couple times for me, I got cocky.