Olympic champ Faith Kipyegon says being 1st woman to run 4-minute mile would 'cement my legacy'

Faith Kipyegon's already a three-time Olympic 1,500-metre champion. She's already the world-record holder in the mile (1,609m) and 1,500. Next on her to-accomplish list: Become the first woman to break the four-minute mile barrier. She'll make the attempt on June 26.