Casey Butt gained a lot of popularity on the Internet thanks to his formula estimating the maximum muscular potential that a natural bodybuilder can acquire. Unfortunately, the formula has one large flaw – the data is based on bodybuilders who have used anabolic steroids.
Casey Butt examined bodybuilding champions between 1947 and 2010 and based his formula on bodybuilders with a questionable natural status such as Reg Park and Steve Reeves. I am almost sorry to inform you that steroids were widely used in the late 30s when many people start experimenting with early forms of testosterone.
If a formula designed to measure the maximum muscular potential that can be achieved naturally is based on false data, it loses its accuracy regardless of the science behind it. False data in = false data out.
Having said that, Casey Butt’s idea that the natural muscular potential is dependent on joint size is actually correct. Men with large frames carry more muscle mass than individuals with thin bones. However, even the naturals who have big bones cannot surpass the limitations of natural bodybuilding and shock the world.
Nevertheless, nattyornot.com advises people to stay natural and focus on developing skills and strength that will serve you well throughout life. By skills, I mean stuff like bodyweight planches, a two-times bodyweight squat, 20 pull-ups in a row or any other strength or endurance feat that you would like to have under your belt. When you focus on developing skills instead of constantly obsessing over your physique, training becomes much more stable and enjoyable. Give it a try.