12 Long Run Tips Every Half Marathon Runner Should Know
Your weekly long run is the cornerstone of successful half marathon training.
It isn’t simply about covering more kilometres than you did the previous week. A well-executed long run builds the endurance, confidence and resilience you’ll need to comfortably cover 21.1 kilometres on race day.
Whether you’re training for your first half marathon or chasing a personal best, these tips will help you get far more out of every long run.
1. Run Easy Enough
One of the biggest mistakes runners make is turning every long run into a race.
Most of your long runs should be completed at Level II intensity. This should feel comfortable enough that you can hold a conversation in full sentences without becoming breathless. If you’re struggling to talk, you’re probably running too hard.
Running at Level II allows you to:
- Build your aerobic fitness.
- Recover more quickly.
- Complete the planned distance comfortably.
- Be ready for your next quality workout.
Remember, your long run is about building endurance—not proving your fitness.
2. Don’t Increase Your Distance Too Quickly
Consistency beats big jumps.
As a general guideline, aim to increase your longest run by no more than around 10–15% compared with your previous long run. This gives your muscles, tendons and joints time to adapt while steadily building endurance.
For example:
- 40-minute long run → next long run approximately 44 to 46-minutes.
- 1:20hr long run → next long run approximately 1:30hr.
Remember, this is only a guideline. Most well-designed half marathon plans will also include occasional “step-back” weeks where the long run is reduced slightly before building again. These easier weeks help absorb the training and reduce the risk of injury.
Patience almost always produces better long-term results than trying to progress too quickly.
3. Practise Your Race-Day Nutrition
Your long run is the perfect opportunity to discover:
- Which gels work for you.
- When to take them.
- How much fluid you need.
- What to eat beforehand.
Never try anything new on race day.
If a particular gel upsets your stomach during training, you’ve just learnt a valuable lesson while it doesn’t matter.
4. Wear Exactly What You Plan to Race In
Long runs are your dress rehearsal.
Use them to test:
- Shoes
- Socks
- Shorts
- Running top
- Sports bra
- Hydration vest or belt
- Hat and sunglasses
If something rubs over 15 kilometres, it’ll almost certainly rub over 21.1 kilometres.
5. Start Slower Than You Think
The first few kilometres should feel almost too easy.
Many runners begin their long run far too quickly and spend the second half simply trying to survive.
Instead, ease into the run and allow your pace to settle naturally.
A controlled start usually leads to a much stronger finish.
6. Include Some Race Pace Running
Not every long run has to be slow.
As race day approaches, consider adding sections at your planned half marathon pace.
Examples include:
- Final 3–5km at race pace.
- 2 × 3km at race pace.
- Progressive long runs where you gradually increase your pace.
These sessions teach your body what race pace feels like when you’re already a little fatigued.
7. Think About Time, Not Just Distance
For many runners, focusing on time rather than kilometres is a smarter approach.
Running for 90 minutes, 1 hour 45 minutes or 2 hours develops the endurance you need regardless of whether you’re running 5:00/km or 7:00/km.
This keeps the training appropriate for runners of different abilities.
8. Don’t Skip Recovery Afterwards
Your long run only makes you fitter if you recover from it.
After finishing:
- Refuel with carbohydrates and protein.
- Rehydrate.
- Stretch gently if it helps you.
- Get a good night’s sleep.
The recovery process is where your body adapts and becomes stronger.
9. Learn to Run on Tired Legs
Some weeks you’ll begin your long run feeling fresh.
Other weeks you’ll still have a little fatigue from earlier training.
That’s perfectly normal.
Learning to keep moving when you’re not feeling 100% builds both physical and mental resilience for race day.
10. Don’t Worry About Running the Full 21.1km
Many first-time runners believe they must complete the full race distance before race day.
You don’t.
For most half marathon runners, a longest run of approximately 18–20km is more than enough to prepare successfully. Overall weekly consistency is generally more important than completing the full race distance in training.
11. Stay Flexible
Life happens.
If you miss one long run because of work, family commitments or illness, don’t panic.
Avoid trying to “make it up” by squeezing extra distance into the following week.
Simply get back into your normal training schedule.
One missed run won’t ruin months of preparation.
12. Enjoy the Journey
Long runs aren’t just training sessions.
They’re an opportunity to:
- Explore new routes.
- Run with friends.
- Watch the sunrise.
- Build confidence.
- Celebrate how much fitter you’ve become.
Many runners eventually discover that their weekly long run becomes their favourite session of the week.
Enjoy the process.
Finish with Stride Outs
Not every long run needs to finish with tired legs.
Every few weeks, consider adding 4 × 20-second stride outs towards the end of your long run. Spread them roughly five minutes apart during the final 30 minutes, leaving around 10 minutes of easy Level II running after your final stride out.
These aren’t sprints. Instead, gradually accelerate to around your 3–5km race pace, hold that relaxed, quick rhythm for 20 seconds, then ease back into your normal running pace.
Stride outs help improve:
- Running economy.
- Leg speed.
- Coordination.
- Running technique when slightly fatigued.
They also leave your legs feeling quicker and more responsive without adding significant fatigue.
Final Thoughts
If there is one session you should protect each week while training for a half marathon, it’s your long run.
Run it consistently, keep most of them easy, practise your nutrition and pacing, and gradually build your endurance over time.
Remember, successful half marathon training isn’t about one spectacular long run. It’s about completing many good long runs over several months. That’s what gets you to the start line feeling prepared—and to the finish line feeling proud.
Ready to Build Your Best Half Marathon?
A great half marathon isn’t built from one perfect long run—it’s built from weeks of consistent, well-planned training.
The NZ Half Marathon Hub+ gives you everything you need to prepare with confidence, including structured training plans, progressive long runs, race-specific guidance, coaching support, and access to a growing library of resources for New Zealand half marathon runners.
Whether you’re training for your first 21.1km or chasing a new personal best, you’ll know exactly what to do each week—and why you’re doing it.
Join the NZ Half Marathon Hub+ today and start training smarter for your next half marathon.
