Have you ever wondered why it’s so much harder for you to put on muscle compared to someone else? How is someone so much faster than you in a race even though you’ve practiced much more than them? Well, this is largely due to genetics. Genetics comes into play with bodybuilding in numerous ways. It could even be the factor that causes you to excel in the gym or fail. Three ways that genetics affect bodybuilding are our appetite, our muscle insertions, and, lastly, our ability to build muscle.