Eliud Kipchoge broke the two-hour marathon barrier with a time of 1 hour, 59 minutes, and 40 seconds. This achievement will not be recognized as an official world record due to the use of a team of rotating pacemakers and other conditions. Kipchoge's run was an experiment to see if it was possible to shave a couple dozen seconds off the marathon time. The run was assisted by a pacing car with a laser projection to help the runners maintain a consistent pace.