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To build muscle mass for weight gain, you need to train with heavy weights, more specifically, heavy free weights. A heavy weight is one that is challenging for you. This means that it could be 5 lbs if you have never lifted a weight in your life. You don't want to injure yourself, so challenge your muscles, but don't push yourself into injury! To ascertain if a weigh is challenging, try the following: complete 8-12 reps and if you muscles temporarily fail, you are using the right weight. Heavy weights will stimulate more muscle fibers, and therefore more growth, than lighter weights, therefore, additional muscle stimulation means additional muscle growth.