Yes yes yes. Lift heavy, but be careful and not hurt yourself, or give yourself a hurnia. "Muscles look bigger when they are stronger" I used to be a skinny kid in high school, and I was like you wanted to get big. I took the advice of a body builder, and started lifting very heavy and doing lower reps, increasing my weight everytime I went to the gym. Guess what I got big as hell, but once I stopped working out, I got really big, and now it is kinda hard to come down from that size and mass. Just be careful what you wish for, if you are thin, and cut, try doing alittle more heavier weights, but don't bulk to fast, I think. Mike recommended a good routine. I used to do one similar to that, and it worked great. Remember eat right, make sure you body is getting protein and carbs it needs. Also may want to get on some natural suppliments like Creatine, or something that will make your muscles look fuller and shorten your recovery time. When you hit the weights hard, your muscles will feel it. Good luck..