Helping someone unlock the power of spite is awesome.
As for "Tremendous power", I think we're all in great (as in good, but more so) danger from your hyperbolic funnyness seeping out of the comics, and something.... (anyone more creative care to weigh in?)

"RUN FASTER! OR I'LL HIT YOU WITH THIS CAR.".... I wish I had a friend that was as dedicated to me. Once again, Scott, comedy gold.

Spite is often the best motivator.

Wasn't there a comic about how Rick enjoys getting up and running every morning too?

That fourth panel was brilliant.

I'm actually getting in shape thanks to the power of spite!

The power of spite = my life-force. May the force be with you, Rick.

I have now read through all of your comics from the day one, and it was worth the effort! Good stuff!

"The Power of Spite" - there is no greater motivator.

Some would be astonished at the amount of spite I burn as fuel.

Why is it that the third panel's punchline is almost always better than the fourth's? Such good stuff.

Every Seinfeld afficianado knows that spite makes the world go 'round!

As a grown man who spent too much time stuffed in lockers as a young man, I can attest to the power of spite.

I've since learned to enjoy the gym,the people there and found intrinsic pleasure in working out, but it all started with spite.

TL,DR: What @Travis Reno and @Paddy said.

The greatest of all motivations: purposely pissing someone off.

You may have car, but do you have A SPATULA! (or maybe that's only allowed for the assistant coach)

You could carry some kind of stick or bat, and lean out the car window to swipe at his legs whenever he slows down. And don't forget the bullhorn!

I like to think Scott was using air quotes for every sentence in panel 2.

'I could be your "coach."'
'I know "everything" about distance running', etc