U.S. Olympic sprinter Allyson Felix has become a new world record holder after winning her 12th gold medal. In doing so, she broke a record previously held by retired Jamaican sprinter Usain Bolt, for the most gold medals won at the track and field World Championships.
The 33-year-old athlete, who is considered one of the most decorated U.S. female track and field Olympians of all time, won the record-breaking gold in Doha, Qatar, on Sept. 29 in the first-ever mixed-gender 4x400-meter relay race.
