Twenty-one-year-old Chris Nikic just completed an Ironman Triathlon by swimming 2.4 miles, cycling 112 miles and running 26.2 miles. This makes him the first person with Down Syndrome to participate in the event, which took place in Panama City Beach, Fla. Nikic has earned official recognition from Guinness World Records. "You have shattered barriers while proving without a doubt that anything is possible," the official Ironman account tweeted.

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