"I had a crash and broke my back and injured my hands and ribs," Muniz told his Dancing With The Stars partner Witney Carson on the show's premiere.
He said that while the incident happened years ago, it still very much affects everything he does.
"I'm 31 but feel like I have the creaky, old body of a 71-year-old," said the actor. "But I'm doing whatever it takes to take care of my body so I can continue dancing. I've raced Indy cars, I've played every sport, I consider myself a pretty athletic person, but I'm so sore. I'm so dead. I'm in the sauna, I'm icing. Everything that I'm doing every minute of the day is to make me a better dancer in this competition and make it to the end."
"I'm so scared to dance in front of people. I didn't even know if I could dance, but now that I'm doing it I don't want to stop any time soon," cotinued Muniz, who also suffered a "mini stroke" in 2012 at the age of 26. "I'm having the time of my life."
Pro-dancer Carson, 23, agreed, saying of her partner: "This guy is amazing. He's so hard working and wants to do the best that he can. We're having a blast."
We pay for juicy info! Do you have a story for RadarOnline.com? Email us at firstname.lastname@example.org, or call us at (866) ON-RADAR (667-2327) any time, day or night.