Boy Trains Other Kids So They're Not Bullied. Now, He's Racing Usain Bolt.

"Strength. No weakness."

Demarjay Smith, an 8-year-old boy who's training video went viral this month, appeared on the "The Ellen DeGeneres Show" to explain exactly what motivates him to work out and stay fit.

Smith explains that he started exercising so that he wouldn't get bullied. Moreover, he goes around his neighborhood to encourage other kids to do the same.

"I had a cousin who was bullied about his size and his weight so then I had to do something because, like you see on the TV, I gotta be fit and strong."

And when DeGeneres asked Smith about where he gets the energy and the spirit to motivate others to exercise, he says:

"Well, it's just who I am."

Smith, who tells DeGeneres he does 90 push-ups a day (yes, 90), then says that he'd love to challenge Olympian Usain Bolt to a race.

"Do you think that you could beat him?" DeGeneres asks.

"Yeah, 100 percent!" Smith says without hesitation. 

Challenge accepted.

Bolt, who had been waiting backstage at the show, surprises Smith and is ready to accept the 8-year-old's challenge.

Then, the two head outside to face off in a sprint. Let's just say we thing Smith has a bright, athletic future ahead of him.

Be sure to watch the full video below: