It's all dependant on the calories you're taking in. Don't want alot of mass? Don't eat tons of food, or balance out your diet with intense exercise so you're burning the calories that you're taking in throughout the day. It takes anywhere from 500-1000 calories over the amt you're burning to put on mass. As Omega said, you will put on some mass from any exercise you do, after you balance out to your goals, you'll then have to maintain that same caloric intake to avoid deanimating muscle or increasing in mass.