10) Competition. Being challenged by a worthy opponent, or the prospect of winning or outperforming yourself
I thrive off competition, against others and myself. I don't know why I'm like this, but I am very competitive and some could say I have an addictive personality. Although it seems to work well with sports as you try to push your body to the limits. When you find someone who has managed to get to a level beyond yours, it gives you something to aim for.