The UFC is home to some of the best MMA fighters in the world. The guys who step into the Octagon are amazing athletes who seem to be capable of anything.
But that's not to say they don't have something they need to work on.
Even the top guys in the game need to constantly evolve and improve their skills in order to remain on top. Like the old saying goes, "getting to the top is hard but it's even harder to stay on top." Although the men on this list are some of the best fighters in the world, each of them has something either inside or outside the Octagon that they need to improve upon.