It's not everyday you see a 6'1", 250 pound pro wrestler brought to tears by a little kid, but that's just what happened to John Cena.

The WWE superstar has inspired countless fans since he debuted in 2004, with his signature do or die attitude and his motto "never give up." But the burly wrestler also has a softer side that he likes to show off.

In the ring, Cena is known as a record breaker for his 13 reigns as WWE Champion, but he set an even more impressive record outside the ring in 2015. That's when Cena granted his 500th Make-A-Wish, inviting a terminally ill child to meet him in person.

Since granting his first Make-A-Wish in 2004, Cena has been making sick children smile ever since, granting more wishes than any other celebrity in the charity's history. He says he just wants to give these children "a day as a real kid," and an "experience that will stay with them forever."

But recently, some of the people Cena has inspired through the years paid him back. In the emotional video Cena arrives on set to read some touching fan mail, and has no idea what's really in store for him.

A handful of the thousands of fans who took Cena's "never give up" motto to heart were actually in the studio.

As they watched, Cena read their letters about overcoming tragic accidents, tough family situations and painful medical conditions. The wrestler was obviously choked up as he realized how much he meant to his fans.

One of the most moving stories came from a little boy who got one of Cena's signature wristbands at a WWE show. He gave it to his mother as a good luck charm during a risky cancer operation, and just as the video telling his story ended the boy burst into the room to thank Cena in person.

The star called it the "coolest surprise ever," hugging and thanking his fans as they came into the room one by one. They presented Cena with a "Life Changer" trophy, but the humble star insisted they were the real heroes.

"Just remember that you guys do the work," he said. "Don't think that you're the only one who's up against it and don't think that you're the only one who doesn't have challenges to face every day. You all lead by example and I mean it when I say it, never give up."

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