Training Heavy To Build Muscle Mass If you want to build appreciable muscle mass and massive strength, you cannot train with light weights. You must literally force the muscles to grow by training with ever-increasing loads. Christian Bale attests to this fact: "I couldn't do a single push-up and so we had months ahead of us. I was just down at the gym with this good crazy ex-marine trainer friend of mine who just made me lift just impossible heavy weights for...