Last updated: 3 October 2026
Reviewed by Jordan Morley, FA Level 2 Football Coach
A negative split means completing the second half of a race faster than the first. It is the pacing strategy used in the majority of world records across distance events — going out slightly conservatively preserves glycogen and delays fatigue, allowing a stronger finish. The opposite (positive split, where the first half is faster) is the most common amateur mistake. An even split (equal halves) is also valid. At marathon distance, a negative split reduces the risk of ‘hitting the wall’ late in the race.
- Second half faster than the first
- Strategy behind most world records
- Requires restraint in the early miles
- Reduces risk of bonking/the wall in marathon
In practice
Running the second half of a race faster than the first — a negative split — is widely associated with smart pacing and strong finishing performances, since it means an athlete had enough reserve to accelerate rather than fade, whereas most recreational runners unintentionally positive-split (slowing in the second half) due to starting too fast relative to their actual fitness.
FAQ
Is a negative split always the fastest way to race?
Not necessarily the absolute fastest for every distance, but it's widely considered a sign of smart, sustainable pacing, and many coaches recommend targeting an even or slightly negative split as a practical pacing strategy.
Why do so many runners positive-split unintentionally?
Adrenaline and race excitement commonly cause runners to start faster than their actual sustainable fitness allows, leading to an unplanned slowdown in the second half as fatigue catches up with the early pace.