You've trained for weeks (or months). The last thing you want is a preventable mistake ruining your race. These are the 10 errors we see runners make over and over — and every single one is avoidable with a little preparation.
1. Not Doing a Shakeout Run the Day Before
What goes wrong: You skip the day-before run because you're "resting," then show up on race morning feeling stiff, sluggish, and disconnected from your body.
How to prevent it: Do a short shakeout run the day before — 10 to 20 minutes at an easy pace with a few strides at the end. This isn't about fitness. It's about keeping your legs loose and your nervous system primed. Think of it as waking your body up before the big day.
💡 Quick tip: Run in your race shoes and outfit. It's a final gear check and a confidence booster.
2. Trying New Gear on Race Day
What goes wrong: You bought new shoes last week, or you're wearing that free race T-shirt for the first time. By mile 3, you've got blisters, chafing, or a waistband that's driving you insane.
How to prevent it: The golden rule — nothing new on race day. Every piece of gear should be tested in training. Shoes, socks, shorts, sports bra, hat, watch band — everything. If you haven't run in it at least twice, it doesn't belong on race day.
💡 Quick tip: Wear the race T-shirt after the race. That's what everyone does.
3. Skipping Body Glide / Anti-Chafe
What goes wrong: Around mile 5, you feel a sting under your arms, between your thighs, or on your nipples. By the finish, you're raw and bloody. Post-race shower becomes a horror movie.
How to prevent it: Apply anti-chafe balm (Body Glide, Squirrel's Nut Butter, or plain vaseline) to every friction point before you start: underarms, inner thighs, nipples, bra line, waistband area, and anywhere your clothing seams rub.
💡 Quick tip: Guys — if you're running more than a 10K, seriously consider nipple guards or tape. Trust us on this one.
4. Starting Too Fast
What goes wrong: The gun goes off, adrenaline kicks in, and you blow through your first mile 30–60 seconds faster than your goal pace. By the halfway point, you're dying. The last few miles feel like a death march.
How to prevent it: Have a pace plan and stick to it. Check your watch at the first mile marker. If you're too fast, actively slow down. The first mile should feel easy — almost too easy. That discipline pays massive dividends in the second half.
💡 Quick tip: Most runners' best race strategy is negative splits — running the second half slightly faster than the first.
5. Forgetting Your Bib or Timing Chip
What goes wrong: You arrive at the starting line and realize your bib is on the kitchen table. Or you ran the whole race and your timing chip wasn't attached, so you have no official finish time.
How to prevent it: Pin your bib to your race shirt the night before. Attach your timing chip at the same time. Put everything by the door. Then in the morning, do a final pat-down: bib on chest, chip on shoe, watch on wrist. Done.
💡 Quick tip: Take a photo of your bib number and save it on your phone as a backup.
6. Not Eating Enough the Morning Of
What goes wrong: You skip breakfast because of nerves or fear of stomach issues. By mid-race, you're running on empty — lightheaded, sluggish, and bonking hard.
How to prevent it: Eat a familiar breakfast 2–3 hours before the start. Emphasis on familiar — something you've eaten before morning runs. Toast with peanut butter, oatmeal with banana, a bagel with honey — keep it simple, carb-focused, and low in fiber and fat.
💡 Quick tip: If you can't stomach solid food early, try a liquid option like a smoothie or meal replacement shake.
7. Overdressing for the Weather
What goes wrong: It's 45°F at the start and you're bundled up like it's January. Two miles in, you're overheating, stripping layers, and carrying a jacket you wish you'd left behind.
How to prevent it: Dress as if it's 15–20°F warmer than the actual temperature. You should feel slightly cool standing at the start line. If you're comfortable before the gun goes off, you're overdressed. Use a throwaway layer for the corral wait.
💡 Quick tip: Arm sleeves are brilliant — easy to push down or remove without stopping.
8. Arriving at the Start Too Late
What goes wrong: You underestimate traffic, parking, or how far you have to walk from the car. You arrive stressed, skip your warm-up, can't find the porta-potties, and barely make it to the start in time.
How to prevent it: Arrive at least 60–90 minutes before gun time for a big race, 45–60 minutes for a smaller one. Scope out parking in advance. Know where the start area, bag check, and bathrooms are before race morning. Build in a buffer — there's no such thing as arriving too early.
💡 Quick tip: Drive the route to the venue the day before if it's in an unfamiliar area.
9. Ignoring the Porta-Potty Line Timing
What goes wrong: You figure you'll "just use the bathroom real quick" 10 minutes before the start. The line is 50 people deep. You either miss the start or spend the first mile desperately searching for a porta-potty on the course.
How to prevent it: Use the porta-potties as soon as you arrive — even if you don't feel like you need to. Then get back in line again 30 minutes before the start. The lines are shortest early and longest right before the gun. Some veterans hit the bathroom three times before a big race. No shame in that.
💡 Quick tip: Look for porta-potties farther from the start line — they usually have shorter lines.
10. Going Out Without a Fueling Plan
What goes wrong: For races longer than a 10K, you need to eat during the run. Without a plan, you either skip fueling (and bonk) or grab something unfamiliar at an aid station (and spend the last miles with an angry stomach).
How to prevent it: Know your fueling schedule in advance. A common approach for half and full marathons: take a gel or chew every 45 minutes, starting at mile 4–5. Practice this in training with the exact same brand and flavor. Carry your own fuel — don't rely solely on what the race provides.
💡 Quick tip: Tape gels to the inside of your race belt or safety-pin them to your shorts for easy access.
The Common Thread
Notice a pattern? Every mistake on this list comes down to one thing: lack of preparation. The race itself is the reward for all the training you've done. Preparation is what makes sure nothing gets between you and your best performance.
A simple race-day checklist catches every single one of these mistakes before they happen. That's not a coincidence — it's the whole point.
Never forget anything on race day
Startly generates personalized race-day checklists based on your distance, weather, and timing.
Try Startly FreeNow go out there and have a great race — mistake-free. 🏁
