The Half Marathon Checklist: 30 Items to Check Before Race Day

Why a Checklist Matters More Than You Think

I've watched runners show up with months of solid training and then lose the race in the 48 hours before the gun — not because their fitness failed them, but because a detail did. A missed breakfast. Shoes with 300 miles on them. A pace goal built on hope instead of math.

The half marathon is a distance that punishes small errors more than people expect. It's long enough that pacing mistakes compound [PMID:30646638], but short enough that there's no time to fix them mid-race the way you might in a marathon. Research on half-marathon participation trends shows the field has grown more diverse in age, experience level, and goals over the last two decades [PMID:36326961] — which means more runners toeing the line without a clear pre-race system.

This checklist isn't about being obsessive. It's about removing decisions from race morning so your brain can do one job: run.

Print it. Tape it to your fridge. Check boxes the week of the race.

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Training Prep (2–4 Weeks Out)

• Longest run of training cycle completed at least 2–3 weeks before race day
• Weekly mileage tapering has started — reduce volume, keep some intensity
• No new training stress introduced (new shoes for long runs, new strength moves, new routes with big elevation swings)
• Injury check — any nagging pain addressed with a professional, not just "running through it"
• Sleep tracked for the past 2 weeks — aiming for consistency, not just total hours

A study on training volume and half-marathon performance found that runners who included a long run of at least 18–20 km in their buildup had better performance outcomes, but also a higher injury rate above certain thresholds [PMID:32421886]. The lesson isn't to avoid long runs — it's to respect the dose-response curve. More is not automatically better once you're two weeks out.

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Gear & Logistics

• Race-day shoes have at least 20–30 miles on them (broken in, not brand new)
• Race-day outfit has been worn on a long run — nothing untested
• Bib, timing chip, and pins packed the night before
• Weather forecast checked and outfit adjusted accordingly
• GPS watch charged to 100% the night before
• Backup nutrition/gel storage (pocket, belt, or handheld) tested during training
• Parking/transport plan confirmed, including buffer time for delays

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Nutrition & Hydration

• Race morning breakfast rehearsed at least twice during training — same timing, same food
• Hydration plan set for the 24 hours before the race, not just race morning
• Caffeine timing decided in advance if you use it — test the dose and timing beforehand, don't improvise
• In-race fueling plan written down: what, when (by mile or by time), and how much
• No alcohol the night before (obvious, but worth the checkbox)
• Electrolyte strategy planned if racing in heat or humidity

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Pacing & Strategy

• Goal pace calculated from realistic training data, not wishful thinking
• Pace plan broken into segments — first 5K conservative, middle 5K controlled, last 5K earned
• Backup goal (Plan B pace) identified in case Plan A isn't happening by mile 8
• Course profile studied — know where the hills and turns are

Pacing data across half marathons shows a consistent pattern: even a modest positive split (running the second half slower than the first) correlates with poorer overall performance, and this effect is more pronounced in less experienced runners [PMID:30646638]. Men, in particular, tend to start faster relative to their fitness than women do, based on pacing studies across race distances [PMID:30646638]. If you don't know your history here, assume you're an over-starter and build in restraint on purpose.

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Recovery & Physical Readiness

• Legs feel fresh, not heavy — if they're not, the taper wasn't enough
• Foam rolling / mobility work done in the final week, nothing aggressive
• No new supplements introduced in race week
• Resting heart rate checked — a noticeably elevated RHR in the days before the race can signal under-recovery or incoming illness
• Hydration status confirmed (pale yellow urine, not dark)

Worth noting for masters runners specifically: research on cardiac responses to prolonged endurance exercise found that while the heart adapts remarkably well to training load over time, older athletes show measurable differences in post-exercise cardiac recovery markers compared to younger athletes, even at similar fitness levels [PMID:40667749]. This doesn't mean masters runners should be afraid of racing — it means recovery windows deserve more respect, not less, as we age. I say this as someone racing in the 45-49 age group myself: what got you through recovery at 30 is not always enough at 47.

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Mental Prep

• Race morning routine written down, minute by minute, so there's no decision fatigue
• A mantra or mental cue chosen for the hard miles (10–11 for most half marathoners)
• Realistic expectations set based on training, not on a PR chased from ego
• A clear "why" for this race identified — it matters more at mile 10 than it does at mile 1

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The Bigger Picture

Emerging research on exercise biomarkers is starting to give coaches better tools to understand how an individual athlete is responding to training and race stress — not just from performance data, but from physiological markers that reflect real-time readiness [PMID:41922043]. We're not fully there yet in terms of accessible, everyday use for recreational athletes, but the direction is promising: less guessing, more data-informed prep.

Until wearable biomarker tools are standard, though, this checklist is what most of us have. It's low-tech. It works because it forces attention to the details that decide races — not the heroic stuff, the boring stuff.

Henri's take: The runners I coach who race their best aren't always the most talented. They're the ones who treat race week like a system to execute, not a mystery to hope through. Print this list. Use it every time. It gets easier, but it never stops mattering.

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References

1. Siebers M, Bizjak DA. Exercise biomarkers. Adv Clin Chem. 2026. [PMID:41922043]
2. Frandsen J, Aaroe M. Cardiac Effects of Prolonged Endurance Exercise in Young and Older Athletes. Scand J Med Sci Sports. 2025. [PMID:40667749]
3. Nikolaidis PT, Knechtle B. Participation and performance characteristics in half-marathon run: a brief narrative review. J Muscle Res Cell Motil. 2023. [PMID:36326961]
4. Fokkema T, van Damme AADN. Training for a (half-)marathon: Training volume and longest endurance run related to performance and running injuries. Scand J Med Sci Sports. 2020. [PMID:32421886]
5. Nikolaidis PT, Ćuk I. Pacing of Women and Men in Half-Marathon and Marathon Races. Medicina (Kaunas). 2019. [PMID:30646638]