Michael Phelps is an American competition swimmer and the most decorated Olympian of all time. He holds 39 world records (29 individual, 10 relay), surpassing Mark Spitz’s previous record of 33 world records (26 individual, 7 relay). The male swimmers with the next-highest career medal totals have exactly half of Phelps’ total. Mark Spitz, Matt Biondi and Ryan Lochte all have 11.
When Michael Phelps was in the sixth grade, he was diagnosed with attention deficit hyperactivity disorder (ADHD). The more interesting fact about him is he placed his bedroom environment at a high altitude to decreases the amount of oxygen available, which forces his body to work harder to produce more red blood cells and deliver oxygen to his muscles. It also helps Phelps increase his performance endurance and prepare himself for competitions at high elevations.
“Once I'm already in my room I still have to open a door to get into my bed," Phelps said on the CBS News program "60 Minutes" in 2012. "It's just like a giant box. It's like 'boy and the bubble.'”
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