The time recorded for each kilometer segment during a race, providing more frequent pacing feedback than mile-splits. Common in international racing and metric-based training systems.
'Kilometer' comes from French 'kilomètre,' combining Greek 'khilioi' (thousand) and 'metron' (measure), while 'splits' refers to divided time segments. This became standard in international athletics as the metric system dominated global competition.
Kilometer-splits give runners more frequent feedback than mile-splits - every 1K instead of every 1.6K - which can be crucial for maintaining pace in long races. Many world record performances show incredibly even kilometer-splits, like Eliud Kipchoge's sub-2-hour marathon attempt!
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