Every morning in Africa, a gazelle 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 that it must run faster than the slowest gazelle, or it will starve.
It doesn’t matter whether you’re a lion or a gazelle 
when the sun comes up you’d better be running.

(But, unless you’re a runner, you won’t understand.)