4. Bethany Hamilton

American surfer Bethany Hamilton is one of the most intrepid individuals on the face of the Earth.

In 2003, at thirteen years old, she lost her arm in a shark attack.

She was back surfing less than a month later and she went on to win four competitions.

She's been on TV shows and appeared in the motion picture "Soul Surfer," based on her experience.

Maria Sharapova
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