WATCH: 21-year-old Chris Nikic is the first athlete with Down syndrome to attempt an Ironman Triathlon.
Chris Nikic will swim 2.4 miles in open water, cycle 112 miles then run a full 26.2 mile marathon. “I can prove to kids that if I can do it, then they can do it too,” the 21-year-old tells NBC’s Catie Beck.