Tune-up races don't improve marathon time
Tune-up races and time trials in the marathon build phase do not reliably improve marathon finish time, despite being widely recommended in coaching practice.
In plain English
Racing a shorter tune-up event in the 16 weeks before a marathon did not make anyone's marathon time faster. Runners who skipped them finished just as well.
Why it works
Likely null because any pacing-practice or fitness-feedback gain is offset by added fatigue, recovery cost, and disruption of marathon-specific training (long runs, volume, taper).
What it means in practice
Do not include tune-up races in marathon plans on the rationale that they will improve marathon performance. Where a tune-up is included, frame it as a pacing-skill practice or a fitness check, not as a performance booster. Limit to one in the build at most, scheduled to allow full recovery.
The evidence
-
39.3% of runners completed a race or self-run time trial in the 16 weeks before the marathon, but there was no difference in marathon finish time between those who did tune-up efforts and those who did not. The authors framed this as a first formal test of a widely recommended but unevaluated practice.
-
Weekly training volume and longest-run distance were the strongest training-side predictors of marathon performance. No specific mention of tune-up races or race-pace specificity as independent predictors. The evidence base supports volume and long-run distance as the dominant levers; secondary factors are less clearly defined.
Why we call confidence medium
Foster 2012 directly tested the question in a marathon-runner cohort and found no finish-time difference between runners who did tune-up efforts (39.3% of the sample) and those who did not. The evidence is observational rather than randomized, and the absence of randomization leaves room for selection effects. Doherty 2020 meta-analysis identifies volume and long-run distance — not tune-up exposure — as the dominant training predictors of marathon performance.
Where it applies
Recreational marathon runners. Less clear for elite marathoners or shorter goal distances where the cost-benefit may differ.
Does not apply to: events under marathon distance where tune-up race is the goal race itself (e.g., a 5K runner racing a 5K time trial).
Plans that respect this
Plans that scored well on the rubric measures informed by this claim.
- Galloway Time-Goal 5K — Sub-15
- Galloway Time-Goal 5K — Sub-17:30
- 10-Week Run Your First 10k (3 days)
- 10-Week Run Your First 10k (4 days)
- 10-Week Run Your First Half Marathon (3 days)
- 10-Week Run Your First Half Marathon (4 days)
- 10-Week Sub-1:30 Half Marathon (4 days)
- 10-Week Sub-1:30 Half Marathon (5 days)
- 10-Week Sub-1:30 Half Marathon (6 days)
- 10-Week Sub-1:45 Half Marathon (4 days)
- 10-Week Sub-1:45 Half Marathon (5 days)
- 10-Week Sub-1:45 Half Marathon (6 days)
Last reviewed 2026-05-08. See how we score.