While you might think transitioning from marathon to half marathon distance is just reduced mileage and a shorter race, there are actually several key differences between the race distances and how to approach them. In this blog, we cover five essential tips for making the switch successfully: from adjusting your training load and introducing speed work, to managing recovery and resetting your race-day mindset.
Done right, the move to half marathon distance can reignite your love of racing and unlock performances you didn't know you were capable of. Done wrong, it catches even experienced marathon runners off guard. Here's everything you need to know.
Is the Half Marathon Actually Easier Than the Marathon?
The half marathon is shorter, yes. It takes less time to race, requires less weekly mileage in training, and the recovery cost post-race is significantly lower. By those measures, it is less demanding than the marathon.
But "easier" is the wrong word. The half marathon is a different challenge; one that rewards speed, threshold fitness, and the ability to sustain discomfort at a higher intensity for an extended period. Where the marathon tests your patience and endurance, the half marathon tests your courage and pace judgement.
Runners who approach it as simply a shorter marathon often underperform because they bring marathon-paced conservatism to a race that rewards boldness. Here are five things to keep in mind when making the switch.
5 Tips for Transitioning from Marathon to Half Marathon
1. Step Down Your Mileage Gradually
The most common mistake marathon runners make when transitioning to the half is cutting their weekly mileage too sharply, too quickly. It feels logical (a shorter race = shorter training) but your body has adapted to a high training load over months of marathon preparation. Dropping it suddenly leaves many runners feeling flat, sluggish, and more vulnerable to injury as their system tries to readjust.
A smarter approach is to reduce mileage incrementally over 3–4 weeks. If you've been running 50 miles a week in marathon training, bring it down progressively rather than halving it in one go. Your aerobic base is your greatest asset coming from marathon distance, it's the foundation everything else is built on. Protect it, and it will carry you through the final miles of any race
As a rough guide, most half marathon training plans sit in the 30–45 miles per week range for experienced runners. Work toward that gradually, and you'll carry your marathon fitness into your half marathon build rather than losing it in a jarring transition.
2. Embrace Speed Work
Here's something marathon training doesn't offer much of: genuine speed. When you step down to the half marathon, speed work moves from an occasional extra to a central pillar of your training. This shift can be one of the most rewarding parts of the transition, and will come in useful if you step back up to marathon distance, as it raises your threshold barrier and makes "marathon race pace" a lower speed compared to your top end efforts - it will feel easier.
Half marathon pace sits roughly between your 10K pace and your marathon pace: uncomfortably fast, but sustainable if your fitness is in place. Racing it well requires training that reflects that effort. Introducing one quality speed session per week of 20–40 minutes at a comfortably hard threshold effort, or structured intervals at slightly faster than half marathon pace will start to develop the fitness the distance demands.
The encouraging news for marathon runners is that your aerobic engine is already enormous. All you're really doing is learning to use the higher gears. Many runners are surprised by how quickly their half marathon speed develops once they start training for it specifically.
Session ideas to add to your training:
Tempo runs: 20–35 minutes at a comfortably hard effort (you can speak in short phrases but not hold a conversation)
Cruise intervals: 3–5 x 1 mile at threshold pace with 60–90 seconds rest
Half marathon pace miles: 4–6 miles at goal race pace during your midweek run
3. Keep the Long Run, but Reduce the Miles
Your long run remains an important part of half marathon training, but its function changes meaningfully from what you're used to. Where marathon training demands long runs of 18-22 miles focused largely on time on feet and fuelling practice, the half marathon long run sits comfortably in the 10-13 mile range and can be run with considerably more purpose and effort.
Rather than shuffling in on empty legs, many of your half marathon long runs can be progressive, running the first half at an easy, conversational pace and bringing the second half down toward marathon pace or slightly quicker. This builds race-specific fitness while keeping the overall session manageable.
For most runners, this is one of the unexpected pleasures of the half marathon distance. The long run is still long enough to feel like a proper effort and deliver a real training stimulus but short enough that you're recovered for Monday and, crucially, still have a Sunday afternoon.
4. Take Recovery Seriously
One of the genuine advantages of stepping down from the marathon is the recovery dividend. A well-run half marathon typically leaves most runners feeling largely recovered within 3-5 days, compared to the 2-4 weeks it can take to bounce back from a full marathon. This means you can race more frequently, build fitness across a longer season, and stay healthier through a training block.
That said, the faster paces involved in half marathon training carry their own injury risk, particularly to the calves, Achilles tendons, hip flexors, and knees. These structures are placed under higher eccentric load when you're running closer to threshold pace, and the cumulative effect of speed sessions and progressive long runs across a training block adds up.
Managing recovery well means:
Keeping easy runs truly easy. If you're doing two or three quality sessions per week, every other run should be genuinely conversational. Easy running is recovery, not junk miles.
Prioritising sleep. The majority of tissue repair and muscular adaptation happens overnight. Protecting sleep is one of the highest-return recovery habits available.
Looking after your feet. The increased pace of half marathon training means greater impact force with every stride. Our shock-absorbing insoles are engineered to distribute that force more evenly across the foot, reducing the cumulative stress on joints and connective tissue through hard training weeks.
Using the time between sessions. Our recovery slides are designed for exactly the hours between runs; keeping feet supported, calves de-compressed, and tissue loose so you come back to each session ready to perform.
5. Reset Your Mindset
Marathon running demands patience, discipline, and the ability to manage your effort across many hours. The cardinal sin of marathon racing is going out too fast. The half marathon demands something different: the willingness to commit to a pace that is genuinely uncomfortable, relatively early, and hold it with confidence for 13.1 miles.
Half marathon racing sits close to your lactate threshold - the point at which your body is working hard enough that fatigue accumulates meaningfully. Holding that effort from mile 2 to mile 13 requires a different psychological toolkit to the marathon. It's less about managing yourself over time and more about committing to the discomfort and trusting your training.
The runners who thrive at half marathon distance are those who stop treating it as a shorter, easier marathon and start treating it as its own event. That means:
Going out at race pace, not conservatively. The half marathon is short enough that negative splitting is harder to execute than at marathon distance. Running even splits or slightly positive splits is more common at this distance.
Practising race pace in training. Knowing what your goal pace feels like in your body through tempo runs and race-pace miles builds confidence to commit to it on race day.
Embracing the discomfort. Miles 8-10 of a well-run half marathon are hard. That's not a sign something has gone wrong, it's the race working exactly as it should.
Marathon vs Half Marathon Training: Key Differences at a Glance
| Marathon | Half Marathon | |
| Weekly Mileage | 40-60miles / 64-96km | 30-45miles / 48-72km |
| Long Run Distance | 18-22miles / 29-35km | 10-13miles / 16-21km |
| Key Training Focus | Endurance, Fuelling | Speed, Threshold |
| Race Intensity | Moderate, Sustained | High, Sustained |
| Post Race Recovery Time | 2-4 Weeks | 3-5 Days |
*If cross training, e.g. cycling, the mileage will vary to adjust training load.
Frequently Asked Questions
How long does it take to transition from a marathon to half marathon?
For runners coming directly from marathon training with a solid aerobic base, 8–10 weeks of half-marathon-specific preparation is typically sufficient to race the distance well as it's a refinement of existing fitness toward a different set of demands.
If you've had a break from structured training since your last marathon, allow 10–12 weeks to rebuild your base before introducing the quality sessions described above.
Either way, the aerobic foundation you've built through marathon training is a genuine head start. Most runners find the transition faster and more natural than they expected, particularly once the speed work starts to click into place.
How do I pace a half marathon after running marathons?
Your half marathon pace will be considerably faster than your marathon pace, roughly 30–45 seconds per mile faster for most runners. A useful rule of thumb is to double your 10K time and add 10–15 minutes to get a ballpark half marathon finish time. From there, build to that pace in training through tempo runs and race-pace sessions so it feels familiar on race day.
Will my marathon training help with the half marathon?
Absolutely! The aerobic base built through marathon training is one of the biggest advantages you can bring to half marathon racing. High mileage, long runs, and the mental resilience developed through marathon training all transfer directly. The main adjustment is learning to run faster and more comfortably at higher intensities, which comes with specific half marathon training.
Should I do less strength training when transitioning to the half marathon?
No - Strength training becomes more important at half marathon distance, where the higher training paces increase the load on joints and connective tissue. Key exercises like single-leg deadlifts, calf raises, and plyometrics directly support the speed and injury resilience the half marathon demands. Two sessions of 15–20 minutes per week is sufficient for most runners.
How many half marathons can I run in a year?
With the shorter recovery time compared to the marathon, most runners can comfortably race 3–5 half marathons per year with proper training structure between events. Some experienced runners race more frequently. The key is treating each race as part of a structured season rather than running them back to back without adequate preparation.
Is it normal to feel slower in training when switching from marathon to half marathon?
Initially, yes, particularly if you reduce mileage sharply. As your body adjusts and speed work begins to take effect, most runners find their paces improve quickly. Give any new training approach 4–6 weeks before drawing conclusions about your progress.
Train Smart, Recover Smarter
The transition from marathon to half marathon is one of the most rewarding shifts a runner can make, but the training demands are different enough that the right kit matters.
Our shock-absorbing insoles help manage the increased impact load that comes with faster half marathon training, spreading force across the foot and protecting joints through your hardest sessions. And our recovery slides support the hours between sessions - keeping the calves, Achilles, and plantar fascia loose and recovered so you come back to each workout ready to perform.
👉 Shop Insoles →
👉 Explore Recovery Slides →
The half marathon is not simply a shorter marathon. It's a different event, one that rewards speed, threshold fitness, and a willingness to commit to discomfort. It deserves its own training approach.
Come from marathon training with a gradual mileage step-down, introduce proper speed work, keep your long run but make it work harder, respect your recovery, and reset your race-day mindset. Give it 8-10 weeks of half-marathon-specific preparation and you may well discover this is your favourite distance.
Want more training guides, running tips, and injury prevention advice delivered straight to your inbox? Sign up for the Enertor newsletter below.