Hundreds of thousands of athletes are embracing the sport of CrossFit, but few are as good at it as 18-year-old Nate Trevillian of Raleigh.
"Oh the pain -- it's horrible," Trevillian said of swinging a kettle bell.
But, he added, "It's a lot of fun. I know that's kind of weird to say."
John Dill, owner of Sua Sponte, said, "There's no reason to say he can't be standing on top of the podium at the CrossFit Games as an individual male competitor at some point."
Already, Trevillian is the top-ranked Under-19 CrossFit performer in the world.
So just what is the sport?
"It combines Olympic weight lifting, gymnastics movements, power lifting movements, running, rowing, kettle bells, so it involves everything," Trevillian said. "You can't specialize in one thing."
A CrossFit workout is anywhere from eight to 15 minutes. The object, Trevillian said, is to go "as fast as you can, resting a little bit, and then going as fast as you can again."
With every exercise, Trevillian pushes his body to the limit.
"Pretty much every workout there's a point where your body's going to say, 'Why are you doing this? This is stupid,'" he said.
But that's a key part of the sport, where the mind and body start to clash.
"You get to explore that brain-body barrier for, which one will shut down first," John Dill said. "And what we have found is that every single time, your brain will tell you to stop well before you body actually needs to."
Trevillian's will power has conquered that clash. And now, the recent Leesville Road graduate has his sights set on next year's national competition. And while some of his friends think he's crazy putting his body through torture, Trevillian said it is just part of the game.
"Just like other people play football or basketball and they're committing that much time to it, I'm committing that same time to it, if not more," he said.
Still, it's hard to imagine any other sport that deals in pain like cross-fit.
"The best way to get better is to just go to that place ... a lot," Trevillian said.
That place, he said, is "that pain place," a place where Trevillian is a regular customer.
"It's horrible, but it feels great at the same time," he said.