" Every morning in Africa, an antelope wakes up. It knows it must outrun the fastest lion, or it will be killed. Every morning in Africa, a lion wakes up. It knows it must run faster than the fastest antelope, or it will starve. It doesn’t matter whether you’re a lion or an antelope—when the sun comes up, you’d better be running. "

― Bernd Heinrich , Why We Run: A Natural History