- The fastest time recorded for a marathon is two hours, two minutes, and 57 seconds
- It has taken two decades to decrease the world marathon record by 3 minutes
- New shoe and apparel technology will help break the two hour mark
Vital Signs is a monthly program bringing viewers health stories from around the world. Watch this month's episode on Endurance Training, including the effort to break the 2-hour marathon record, on Wednesday, April 19 on CNN International (1130 and 1830 GMT) and on Saturday, April 22 on CNN (2:30pm ET).
(CNN)Nearly everyone who starts the Boston Marathon completes it. In 2016, around 97% of the starters finished.