This question has been asked multiple times over on many bodybuilding forums and message boards since the inception of the internet. While this question’s answer depends solely on an individual’s genetic ceiling, there’s one very comprehensive resource I’d recommend to anyone in search of reaching their genetic potential for maximum muscular growth.
The resource I am referring to today is an ebook called Your Muscular Potential by Casey Butt Ph.D. He runs the website Weightrainer.net and has devoted insurmountable hours to the study of maximum muscular gains in the drug-free physique athlete.
Casey holds a degree in mathematics, a degree in physics and has his PhD in artificial intelligence for controls engineering. He’s spent the last 18 years in a mad obsession with weight training and altering his body composition through bodybuilding. He also admitted that he wasted his first 10 years of weight training by following the shoddy information found in muscle magazines.