Jamaican Olympic gold medalist Usain Bolt has a new competitor.

8-year-old Demarjay Smith, possibly the world's youngest personal trainer, was featured on "The Ellen DeGeneres Show," where he talked about his love of fitness.

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A video on DeGeneres' show shows Smith training other young boys.

In a distinct Jamaican accent, Smith yelled, "No weakness! Min nuh do weakness!"

He says anti-bullying efforts are what inspired him.

"What made me start is that I go around the neighborhood, and I look to see if kids like exercising. When I see that other kids bully them, that's why I started exercising. So I don't get bullied. I had a cousin that was bullied about his size and weight so I had to do something. I've got to be fit and strong."

He explained how to do a push-up— his favorite exercise— correctly. Smith was anything but modest, telling DeGeneres he does 90 push-ups a day.

When asked about his dream job, Smith said he wants to be a personal trainer and a basketball player. His other dream was to challenge Usain Bolt.

That's when DeGeneres surprised the young boy with an unexpected guest—the Jamaican track star himself.

After busting out a few push-ups with the famous runner, Smith dared Bolt to race on a makeshift track outside.

"Come on Usain, don't be scared of me!" Smith yelled.

Just before the two reached the finish line, Bolt caught a cramp in his leg, granting Smith the victory.