When it comes to gaining muscle, there is no one-size-fits-all answer. Some people may be better off lifting heavy weights while others may do better with lighter weights. The biggest factor that will determine how much muscle you'll gain is how much you're able to put on each week. If you're able to lift more weight than you're supposed to and still see results, then you're doing something right. However, if you're not seeing the results that you want, then it's time to adjust your routine.