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by infamousclyde 1202 days ago
Splits refers to the amount of time passed over a measured distance. A miler would be interested in their 400m split (the time they run through 1/4 of their race), and a marathoner would be more concerned with their mile/km split.

Holistically, pacers are just experienced runners that provide even splits over their distance. In a marathon context, running in a group can be quite pleasant and motivating, but there is definitely nothing stopping anyone from just using a GPS watch.