Right now, he's training for a half-marathon that takes place Sept. 14, and in October he'll do a sprint triathlon. His goal for next year is a half Ironman.
He also wants to help the rest of his family get fit. McCarty has issued a challenge: They're all going to run a 5K together in December.
"I don't want to be a hypocrite to my kids and saying, 'You've got to lose weight now,' " he said. "But I am going to challenge them to do this one thing for me. I think they're going to like the results."
Next month, the family is going back to the same amusement park -- Silver Dollar City in Missouri -- where McCarty had to give up his seat on a roller coaster last summer.
Trying to buckle the seat belt then led to unexpected twists and turns in his life. Now, he's ready to experience the full ride.