Anyone that claims Barry didn't roid up is crazy. No one puts that much muscle in two years. He must of put 60 pounds of pure muscle. Immpossible. I have lifted for 5 years serious and many years of PT, the gym and running. I have gained only 18 pounds of muscle since I started my program 5 years ago.
Actually it depends on body type. I know a guy who gained about 60 lbs of muscle in his time in the Marine Corps.
I personally find it extremely easy to gain muscle mass, unfortunaly I lose it just as fast.