World Record Progression: The Marathon

The Marathon is a distance that many try to conquer for their own reasons, whether it be to finish one or to set a new personal best. A select few, however, would seek to became the fastest in the world across this discipline, and in due time, would break one of the most iconic barriers in sports history as as result. Support the channel!   / runnerboi   Insta:   / runnerboi_yt   Twitter:   / runnerboiyt