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Alternate strategies include even splitting (racing at a steady pace) or sit and kick (also known as a sprint finish). Conversely, the act of completing the first half of a race faster than the second half is known as a positive split. [2] The strategy of negative splitting has been documented in competitive running since the early 20th century.
In the 800 meters, the fastest times have almost always been achieved with a positive-split strategy. A study of 26 world-record 800m races from 1912 to 1997 showed that in 92% of the fastest 800m races, the first half of the race has been run faster than the second half. [7] This implies that the optimal strategy for the 800m is a positive-split.
For the first 5-kilometre section split, they were one second off the pace, going through in 14:14, and they later went through the 10 kilometres (6.2 mi) mark in 28:21. Around 50 minutes into the race, Desisa dropped out of the group before Tadese and Kipchoge went together through halfway in 59:57.
Kiptum negative split again, but this time the first half was covered in 60:48, almost a minute faster than his performance in London (though still 14 seconds behind the world record pace), and he had the stamina to run his second half at 59:47—only two seconds slower than in London, where he set the quickest half in a marathon.
Through 10K, the leading men split 29:27 as they hold 2:04:20 marathon pace. Ten men were in the lead pack, with top Americans Zach Panning and CJ Albertson in the chase pack. The top pack of ten men continued to through 15K in 44:15 before crossing the half marathon mark in 1:02:19.
To break the two-hour barrier, a pace of 2:50 min/km (4:34.5 per mile) was required. In order to achieve this, the racers followed behind a team of six pacers in a triangle formation who were themselves following a pace vehicle displaying a large clock of the race time and projecting green lasers onto the ground to indicate where the lead pacer ...
‘We’re not obsessed,’ said the women’s world-record holder for consecutive days running a half marathon. ‘I would say ‘committed.’ Running ‘caveman-like,’ he’ll surpass 8,750 ...
The runner should be able to sustain this pace for up to 60 minutes during racing. Daniels describes this intensity as "comfortably hard". In elite runners, the pace matches the half marathon one, while less trained runners will run at around 10k pace. Daniels points out the importance of keeping the given pace to reap the benefits of the training.