DXN Code Strike Furthermore, never concentrate on one area of your muscle. You have to focus also on other muscle areas. In this way, you will have a proportionate muscle mass in your body. With this, you have to select the right muscle building training program for you that will develop your body's muscles. Yet, the problem is you cannot do this at the same time. Thus, you need to concentrate on each muscle groups that you want to develop. Do your exercise one at a time. You can do this by doing 3 to 4 sets with your weights to lift increasing each time. This is one of the Muscle Building techniques to build lean muscle mass fast.