HOW TO PACE A 5K AND 10K RACE FOR YOUR FASTEST TIME YET
Published: 14/08/2026 | By: Tommy Trees
Tommy Trees has coached runners through everything from first-time parkruns to PB-chasing 10Ks, and there's one mistake he sees more than any other: starting too fast. Here, he shows you how to pace a 5K and 10K with confidence using simple race day strategies, kilometre by kilometre, covering how to avoid starting too fast, how to run a negative split and how to give yourself the best chance of a new PB.
As a running coach, the biggest pacing mistake I see isn't that runners are too slow; it's that they start too fast. The race begins, adrenaline kicks in and suddenly you're running well above your target pace without even realising it. It might feel comfortable for the first kilometre, but it almost always catches up with you later.
Whether you're preparing for your first 5K, chasing a parkrun PB or taking on a new 10K challenge, pacing yourself properly is one of the easiest ways to improve your performance. Here's how to race smarter.
The Basics Of Smart Race Pacing
Good pacing starts before race day. Your target pace should be based on your current fitness, not simply the time you'd love to run. A recent 5K, 10K or parkrun is the best way to judge what pace is realistic.
Before the race, calculate your goal pace and learn your kilometre or mile splits. Having these in your head makes it much easier to stay on track when the race starts.
One strategy I recommend to many runners is aiming for a slight negative split. This means running the second half of the race a little quicker than the first. It helps you stay in control early before finishing strongly.
While GPS watches are useful, don't rely on them completely. Buildings, trees and weaving through crowds can all affect your pace readings. Instead, combine your watch with perceived effort. If the pace feels sustainable and your breathing is controlled, you're probably running well.
How To Pace A 5K
The biggest mistake I see runners make in a 5K is going off too hard. Personally, I like to use the first kilometre to settle into the race, control my breathing and find my rhythm. It can feel like everyone is flying past you, but don't panic. The race won't be won in the first kilometre, but it can definitely be lost there.
By the time I reach 2K, I want to feel strong and in control. The pace should feel challenging, but you shouldn't be hanging on already. If you're struggling this early, you've probably started too fast.
From my experience, most runners lose the biggest chunk of time between kilometres three and four. That's when an aggressive start catches up with them. However, if you've stayed controlled over the opening couple of kilometres, this part of the race should simply feel hard rather than impossible. Trust your pacing and keep moving forwards.
Then, when you hit the final kilometre, it's time to race. If you've judged the effort well, you'll still have enough left to increase your pace, pass tired runners and finish with a strong kick. That's why I'm always aiming for a slight negative split, finishing the second half of the race a little quicker than the first.
How To Pace A 10K
A 10K is a completely different challenge. Unlike a 5K, where you can afford to get uncomfortable quite early, a 10K rewards patience. One of the biggest mistakes I see is runners trying to bank time in the first few kilometres, but all that usually does is make the second half of the race much harder.
I like to think of the first 3K as settling into the race. Your breathing should be controlled, your stride should feel smooth and you should almost be holding yourself back slightly. If you're questioning whether you've started too conservatively, you're probably pacing it just about right.
From 3K to around 7K, your job is simply to lock into your goal pace and stay consistent. This is where the race can become mentally challenging, so avoid chasing every split on your watch. Instead, focus on your rhythm, relax your shoulders and trust the work you've done in training.
If you've been patient early on, the final 3K is where you can start racing. Gradually increase your effort and aim to pick runners off one by one. There's no better feeling than passing people in the closing stages because you paced the race well, rather than desperately trying to hold on after going out too hard.
A well-paced 10K should leave you feeling like you've raced your hardest over the final kilometre, not like you've been surviving since halfway.
Training Tips To Improve Your Pacing
Like most things in running, pacing is a skill, and the best way to improve it is through practice.
My first tip is to include race pace in your training regularly. Whether it's intervals, tempo runs or blocks within a longer run, getting comfortable at your goal pace means it won't feel unfamiliar on race day. The more often you experience that pace in training, the easier it becomes to judge without constantly looking at your watch.
Secondly, if you're someone who regularly starts races too fast, I love using progression runs. Start comfortably, then gradually increase your pace throughout the run so you finish with your quickest kilometres. It teaches patience, builds confidence and helps you understand what it feels like to finish strong rather than simply hanging on.
Finally, there's no substitute for race experience. The more races you do, the better you'll become at judging your effort and controlling your pace. You don't have to race every weekend, but local 5Ks, 10Ks and parkruns are brilliant opportunities to practise your pacing without the pressure of a major goal race. Treat them as learning experiences and you'll become a smarter racer every time you pin on a bib.
