If you're watching the Olympic Games this year, you may have noticed several athletes(especially swimmers) with big, dark, red circles on their backs and shoulders. Here's why.
Michael Phelps is a bonafide star. In addition to being one of the best athletes in history and the United States’ crown jewel at the Olympic games, the world’s greatest swimmer is also humble, funny, sweet and a just a joy to watch in those post-competition interviews. With his retirement from professional competition pending (if you had as many gold medals as him, you’d consider giving a rest, t