Joshua Cheptegei breaks 5,000m world record

Uganda's Joshua Cheptegei produces an astonishing run in Monaco to break the 16-year-old 5,000m world record by almost two seconds.

Joshua Cheptegei breaks 5,000m world record
Uganda's Joshua Cheptegei produces an astonishing run in Monaco to break the 16-year-old 5,000m world record by almost two seconds.