Effort. Effort alone can be a game changer. Winston Churchill said, "continuous effort, not strength or intelligence, is the key to unlocking your true potential." You do not have to be the strongest, biggest, smartest or fastest; just by expressing more effort, you become a better YOU. You expand. You grow. You reach ambitious goals. You strive for excellence. This trait takes you to your ultimate best you.
I apologize that I don't have the source for the above to give proper credit.
one thing I would add there is consistent effort Every. Damn. Day