Reading through most of the posts that apply, it seems everyone has different opinions on routines and splits. I know every person is different but there has to be some base to start from. I've read eatrainrest's link to the workout split which helps a lot but the exercises i get confused on. My question is, why do some say it's better to train one body part a day and some do two a day like in a three day split? Which is better for size without overtraining or undertraining. When I do one part a week like chest, the next time feels like starting over, like I haven't done chest in a month. I'm looking for size, right now I do a lot of compound moves, heavy weight, no less than 8 reps, no max. My routine is bis/tris - chest- back- shoulders/legs. Pretty much on a mass/size cycle goal, my body weight is increasing so I want to make sure I'm on the right track in the gym for the size goal.