I have been browsing, I just havent found what I am looking for so I figured I would ask. I have no body fat and an extremely high metabolisim. I am 6'2" tall and weigh in at 140lbs. I would love to put on some muscle mass. I was in the Marine Corps for 6 years and talked with the Doc's there, I was told that I wouldnt gain any weight until my metabolisim slows down. We did insane ammounts of cardio while I was in the Corps, so I dont think that helped out any. I now have gym access again and wanted to try and get bigger. I gave up caffeine and carbonated beverages. I guess my questions are this, what kind of diet should I be on and what exercises should I do? I am really new to all of this so if you could break it down "barney" style that would be great! I was told by a friend that I should do like chest/tri, back/bi, then cardio/legs. Do you just hammer away at it like that? Like I said, I have never been in the gym so I dont want to be just walking around aimlessly trying out all the machines and playing around with some weights. I want to go in there with the purpose in mind and know what to do when I get in there. I want to get as big as possible without doing anything harmful to my body....like bad supplements or anything of that nature. Any help is appreciated! Thanks!!