How to Pace a parkrun to Get a Personal Best

If you want to know how to pace a parkrun to get a personal best, the short answer is this: start slower than feels right, settle into an even effort through the middle, and save your hard push for the last kilometre. Almost every runner who misses a PB they were fit enough to run loses it in the first three or four minutes, not at the end.

parkrun is a brilliant place to chase a time. It is free, it is timed, the course is the same every week and there are people around you to pull you along. That last part is also the trap. Saturday at 8am, the start funnel is buzzing, and it is very easy to go out with the fast crowd and pay for it from kilometre two onwards.

Why the first kilometre decides your time

A 5km race is run mostly aerobically, but at a pace close to your limit. If you start too fast, you push into a level of effort your body cannot sustain, and the fatigue builds up faster than you can clear it. You then spend the rest of the run slowing down, and the time you lose in kilometres three and four is almost always more than the few seconds you banked at the start.

Research on pacing in middle distance events consistently shows that even or slightly negative splits (running the second half the same or a little faster than the first) produce better times than a fast start for most runners. Elite 5km and 10km races are often run this way for a reason.

A useful rule: your first kilometre should feel almost too easy. If you are breathing hard and checking your watch in surprise at the 1km marker, you have already gone out too fast.

Work out a realistic target pace

Before you can pace a parkrun well, you need a sensible target. Pick one based on recent evidence, not hope.

• If you have a recent parkrun time, aim for 10 to 30 seconds faster, not two minutes faster
• If you have only run it once or twice, run your next one as a steady effort and use that as your baseline
• Divide your target time by five to get your pace per kilometre (a 25 minute target is 5:00 per km)
• Check the course profile, because a hilly or trail parkrun will not produce even kilometre splits even if your effort is even

A simple kilometre by kilometre plan

Here is a pacing plan that works for most runners chasing a PB. It is based on effort first and pace second.

• Kilometre 1: 3 to 5 seconds per km slower than target pace. Let people go. Find space and settle your breathing.
• Kilometre 2: settle onto target pace. This should feel controlled and rhythmic, comfortably hard.
• Kilometre 3: hold target pace. This is where it starts to bite, so focus on form and the runner ahead of you.
• Kilometre 4: hold on. Most PBs are won or lost here, because this is where people drift without noticing.
• Kilometre 5: start to push. Lift your effort gradually, then empty the tank over the last 300 to 400 metres.

Pace by effort, not just by watch

GPS watches are useful, but they are not perfect. Tree cover, buildings and tight turns can throw your pace reading out by several seconds per kilometre, which is a lot when you are chasing a small PB. Many parkrun courses, including those along the coast and through parks around Cape Town and Johannesburg, have sections where the signal wobbles.

Learn what your target effort feels like. At 5km pace you should be able to say a few words but not hold a conversation. Your breathing is deep and steady rather than ragged. If you can talk in full sentences in the middle of the run, you have room to push. If you are gasping by kilometre two, back off a little and hold.

Warm up properly before the start

A proper warm up is one of the easiest ways to take time off your parkrun. When you start cold, the first few minutes feel much harder than they should, which pushes people to either go out too slow and panic, or go out too fast because their legs feel strange.

Arrive 20 to 25 minutes early. Jog easily for 10 minutes, do a few leg swings and skips, then run three or four short pickups of about 20 seconds at roughly race pace with a walk back between them. Finish the warm up five minutes or so before the start so you are not standing around getting cold.

Racing in heat and at altitude

South African summer mornings can be warm even at 8am, especially in Durban, Gauteng in late summer and inland towns. Heat slows everyone down, so on a hot morning, adjust your target pace by a few seconds per kilometre rather than forcing the same splits you ran in winter. Read our guide on hydration in hot weather if you are training through summer.

If you live at the coast and run a parkrun in Gauteng, expect to be slower. At around 1,500 to 1,750 metres above sea level there is less oxygen available per breath, and most sea level runners notice it immediately. Treat an altitude parkrun as a hard effort rather than a PB attempt.

How to get faster between parkruns

Pacing helps you run the time your fitness allows. To move that number, you need training that builds fitness. Three things make the biggest difference for most recreational runners.

• Plenty of easy running. Most of your weekly kilometres should feel comfortable. See why easy runs should feel slow.
• One quality session a week, such as 5 to 6 repeats of 800 metres at a little faster than 5km pace, with easy jogging recovery
• Two short strength sessions a week focused on the legs and hips. Our guide to strength training for runners covers the exercises that matter most.

If you want a plan that builds toward a specific parkrun target and adjusts each week based on how your runs actually went, that is exactly what our online run coaching is built for.

When to see a professional

Pushing hard over 5km should feel tough, but it should not hurt. If you get chest pain, unusual breathlessness, dizziness or palpitations while running, stop and see a doctor before running hard again. Pain in a joint, shin or foot that changes the way you run, or that is worse the next morning, is worth having checked by a physiotherapist.

Frequently asked questions