Where to even begin with Dana Vollmer? Not only is she one of the best swimmers in the world, she's been in the elite ranks since she was a pre-teen. That's right: Vollmer was 12 (!) when she competed in the 2000 U.S. Olympic Trials. The Texas native failed to make the team that year but, as usual, she moved fast: she won a gold medal at the 2004 Olympics as part of the 4x200 freestyle relay team that broke a world record that had stood for seventeen years.It is not, however, all smooth sailing (smooth swimming?) for Vollmer. In 2003--the year before she would win her gold medal--Vollmer had heart surgery for a medical condition that nearly kept her out of the pool for good.