World 800m leader Amel Tuka has only been running track for 6 years

Bosnia's Amel Tuka has taken the 800 by storm in 2015, improving from a 1:46 guy in 2014 to now the 1:42.51 world-leader and serious gold medal contender in the Tuesday's World Championship final. The 24-year-old talks about his remarkable progression this season, and reflects on his semi-final victory today in Beijing.