Marathon - Wikipedia
https://en.wikipedia.org/wiki/MarathonWorld records were not officially recognized by the IAAF until 1 January 2004; previously, the best times for the marathon were referred to as the 'world best'. Courses must conform to IAAFstandards for a record to be recognized. However, marathon routes still vary greatly in elevation, course, and surface, making exact comparisons impossible. Typically, the fastest times are set over relatively flat courses near sea level, during good weather conditions and with the assistan…
Half marathon - Wikipedia
https://en.wikipedia.org/wiki/Half_marathonA half marathon is a road running event of 21.0975 kilometres (13 miles 192.5 yards)—half the distance of a marathon. It is common for a half marathon event to be held concurrently with a marathon or a 5K race, using almost the same course with a late start, an early finish or shortcuts [citation needed].If finisher medals are awarded, the medal or ribbon may differ from those for …
Marathon Pace Calculator
https://www.omnicalculator.com/sports/marathon-pace21.09.2020 · The marathon pace calculator will automatically fill in the field "distance," showing you the distance you'll have to run. In the case of a marathon, it is 42.195 km. Feel free to change the units to miles, if you prefer the imperial system. Decide on your goal. For example, you might want to run a full marathon in under four hours, so you set ...