It is a well-known fact that genetics play a big part in a person’s body type. Science has only tapped the surface of how our DNA works and how it affects us as human beings. Genetics in a nutshell: If your mom is 5’ tall, your father is 5’6”, it is highly unlikely you will be 6’2’’ and be able to play in the NBA, (unless somewhere down the line your grandfather did). No matter how hard we try, or how bad we want it, if you are not genetically designed to build huge bulky muscles, you most likely will not.
Popular fitness trainer, Jason Ferruggia has written information about muscle gaining secrets genetics and weight lifting in his book, Muscle Gaining Secrets. He states, this is not to say that you can’t build muscles to your genetic potential. With proper nutrition and proper lifting techniques, anyone can gain muscle. Even a beginning lifter, should be able to gain 1.5 % muscle weight increase per 30 days. This amount decreases consecutively per year until he reaches his peak. It’s worth a look.