There are a lot of natural gifts a fighter can have that will help their career, but perhaps the most advantageous is the ability to take a lickin' and keep on tickin'.
Some fighters can take more punishment than others, and then there are those who can take a lot more punishment than others.
These are those men.
These are the men who you can hit with everything you've got and they'll just keep coming for you.
There is something admirable a fighter who is nearly impossible to finish, even though the reason they are so difficult to finish is probably routed in genetics and doesn't have much to do with their actual will.
Today, we take a walk down memory lane, looking back the 30 hardest heads in mixed martial arts history...
Fighters are in no particular order.