In 1982 he broke the half marathon world record by running 61 : 36 in Philadelphia .
At the 1978 All - Africa Games , Musyoki was also 5000 meters silver medalist .
In 1982 Musyoki broke the half marathon world record by running 61 : 36 in Philadelphia .
At the 1978 All - Africa Games , Musyoki was also 5000 meters silver medalist .