A lot of experts say that you’re either destined to have big muscles (bodybuilder look) or you’re not (distance-runner physique). It has to do with the muscle fiber types you’re dealt at birth—the genetics cards. But some cutting-edge research indicates that genetic muscle limitations may not be set in stone. You may be able to go from skinny twig to muscular and big with the right training—and it can happen very quickly and with fairly short workouts (as you’ll see, studies have tripled muscle size in animals in a month; we’ll give you training tips tied to that phenomenon in a moment). [Read more…]