R is for running.

No one would ever guess that we started running to prove we could do what a bunch of fat kids have done, but there it is. And despite your constant complaints that you could never do it you've gone and done it, and better than me to boot. I said you could and you proved me right as ever; you said I couldn't and I didn't. You never think I can do anything and I know you can do everything and that is the difference between you and me.