Repeating an Olympic gold-medal performance is a remarkable feat for any athlete, but it's particularly amazing for someone with type 1 diabetes.
When Gary Hall Jr. earned a gold medal in the 50-meter freestyle at the 2004 Olympic Games in Athens, Greece, he was crowned the fastest swimmer in the world -- a title he also earned at the 2000 Olympic Games in Sydney, Australia.
"Winning the gold is more than the dream of a lifetime coming true. And realizing you're the best in the world when you've dedicated your life to something is very humbling -- with or without diabetes," Gary says. "Having diabetes does affect me, but it isn't an excuse. It just means making some sacrifices along the way."