Carter Julson, 13, received a heart transplant two years ago, after his parents noticed that he wasn't able to keep up with his friends in sports.

"We just sensed something wasn't right," said his father Brian Julson. 

"For a long time, I was just going about, didn't know anything was wrong, and my mom just wanted to make sure because she had read about this disease, and I kind of had some of the symptoms," said Carter Julson.

Then in 2019, doctors discovered he had cardiomyopathy, a disease that impacts the heart muscle. It was a shock for the family.

To view the full article and video, follow this link to CBS News Minnesota.