The Wolf

I ran into a friend of mine at the track once. We decided to have a friendly race... one mile.
Starting off, he pulled just head of me. I thought i could close the distance and pass him after a short bit, but could never quite do it. The whole last lap my body was on fire, and I was pushing it as hard as I could. He crossed the line 10 metres ahead of me. He didn't even look winded, just a dead-set look in his eyes. Afterwards, i asked him how he ran that fast, and he told me it was all in the motivation you light in your mind... imagining your own world and blotting out everything else.
I asked him "what do you imagine?"
He replied, "what do you?"
I told him that to run faster, i like to imagine that i am being chased by a wolf.
He smiles and says, "In my mind, I am the one chasing the wolf."
That was the day I started to understand...