Since he was 11-years-old, Kevin McDowell has imagined what it would be like to be a U.S. Olympian. At 18, a cancer diagnosis looked like it might derail that dream. Now, 10 years later, he's heading to Tokyo with the U.S. Olympic Triathlon Team. #TokyoUnited #TokyoOlympics t.co/htDVfAiSWk