BBC Sport - Rio 2016: David Rudisha breaks 800m world record at London 2012

'Unbelievable' Rudisha smashes 800m world record

BBC Sport continues the countdown to the Rio Olympics with the moment Kenya's David Rudisha smashes the 800m world record with a time of 1:40.91 at London 2012.

Watch full coverage of the 2016 Olympic Games across the BBC this summer.