At 21-years-old, Chris Nikic has become the first person diagnosed with Down syndrome to complete an Ironman competition.
On Saturday, he completed the Ironman Florida course in 16 hours, 46 minutes, after swimming 2.4 miles, biking 112 miles, and running 26.2 miles.
The official Ironman Facebook account highlighted Nikic on its page.
"The opportunities you have created for others around the world through this journey you embarked upon, is immeasurable," the group wrote. "Thank you for allowing us to be a part of your remarkable life story and we can't wait to see what you achieve next."
Nikic had open-heart surgery when he was just 5 months old, and for the first four years of his life, Nikic struggled to even walk.
In an interview with the Orlando Sentinel, Nikic reflected on the obstacles he's overcome, including those who doubted he could achieve.
"The doctors and experts said I couldn't do anything," he said. "So I said, ‘Doctor! Experts! You need to stop doing this to me. You're wrong!'"
Read more at ChrisNikic.com.