Half Marathon Sub-1:40 Training Plan: How to Run a Half Marathon Under 1:40
The Half Marathon Sub-1:40 plan is a 12-week advanced program designed by Ilya Tyapkin, a professional runner and Rio 2016 Olympic marathon representative.
As the plan states: “Over the next three months, you’ll mix easy runs for endurance, tempos for speed endurance, intervals for efficiency, and long runs for stamina. The training builds step by step, then tapers in the final weeks so you reach race day fresh and ready.”
Who This Plan Is For
This plan is designed for advanced runners who already have a solid endurance base and consistent weekly mileage. You are ready for it if your current half-marathon time is between 1:40 and 1:50, you are running 40 to 50 kilometers per week consistently, and you have experience with interval training, tempo runs, and long runs of 15 kilometers or more.
If your current half-marathon time is above 1:50, the Half Marathon Sub-1:45 plan is the more appropriate starting point. This plan reaches weekly volumes of 64 kilometers at peak and includes 8×1km interval sessions and a 10 km race-pace run that requires a well-established aerobic and lactate threshold base to execute correctly.
What Makes This Plan Different
The step from sub-1:45 to sub-1:40 is a meaningful one. Race pace tightens from 4:59 to 4:44 per kilometer, 15 seconds per kilometer faster across the full half-marathon distance. At this level, the training shifts further away from volume accumulation and toward quality execution. Tempo runs reach 10 kilometers at 4:50–5:05 per kilometer. Intervals build to 6×1km and then 8×1km. And the peak week includes a dedicated 10 km run at exact race pace 4:44 per kilometer, which is the clearest possible test of readiness before taper begins.
The critical insight built into this plan is that sub-1:40 is a sustained-threshold problem. Most runners at this level have the speed to run 4:44 per kilometer for a few kilometers. What they lack is the lactate threshold to sustain it for 21.1 kilometers without significant deterioration in the second half. The tempo runs running from 5 km in Week 5 all the way to 10 km in Weeks 7, 9, and 10 are the central training stimulus of the entire plan; they directly raise the pace at which your body can clear lactate, which is what determines whether you hold 4:44 or fade to 5:10 in the final 5 kilometers. As Ilya notes for Week 7: “Peak week of training. Long intervals and a big tempo prepare you mentally and physically for the demands of 21.1 km.”
Plan Structure: 12 Weeks, 5 Phases
Week 1 — Adapt: Four easy runs build rhythm and consistency. No quality work. Focus on habit and finishing each session feeling refreshed.
Weeks 2–3 — Base: Strides are introduced mid-week to build leg speed. An active run on Sunday introduces a steady effort between easy and tempo pace.
Week 4 — Build: Short 200m intervals arrive for the first time. A steady active run on Sunday combines endurance and effort control.
Weeks 5–6 — Build: Intervals grow to 500m repeats. Tempo runs are introduced on Fridays and extend from 5 km to 8 km. Long runs grow alongside.
Week 7 — Build: 1km intervals and a 10 km tempo make this the peak Build week. The long run reaches its longest distance so far.
Week 8 — Recovery: Easy running only. A deliberate reset before the most race-specific training.
Weeks 9–10 — Sharpen / Peak: 1km intervals sharpen with shorter recoveries. Tempo runs push toward race pace. Friday of Week 10 is a dedicated 10 km run at exact race pace.
Week 11 — Taper: Volume drops significantly. Easy running only.
Week 12 — Race Week: Short easy runs Monday and Friday, light strides Saturday, race day Sunday.
Sample Training Week
Week 10 is the most representative and demanding in this plan. It is the peak training week and the one that most directly replicates race demands.
| Day | Session | Load |
|---|---|---|
| Monday | Rest | — |
| Tuesday | 3 km WU + RD / Intervals: 8×1km with 500m jog recovery at 4:30–4:45/km / 3 km CD | High |
| Wednesday | 10 km easy run (low heart rate) | Medium |
| Thursday | Rest | — |
| Friday | 3 km WU + RD / 10 km at race pace 4:44/km / 3 km CD | High |
| Saturday | Rest | — |
| Sunday | 20 km easy run | High |
Total volume this week: approximately 64 kilometers, including 8 km of 1km intervals, 10 km at race pace, and a 20 km long run.
The 10 km race-pace run at 4:44 per kilometer is the most important single session in the entire 12-week plan. It asks you to sustain goal race pace, not interval pace, not tempo pace, but the exact effort you will need to hold for 21.1 kilometers over a distance that already requires meaningful lactate management. Completing it with controlled form and even pacing is the clearest possible signal that sub-1:40 is within reach on race day.
Pace Guide
| Session Type | Pace (min/km) | Pace (min/mile) |
|---|---|---|
| Easy / Low HR Run | 5:05–5:40 | 8:10–9:05 |
| Intervals | 4:30–4:45 | 7:15–7:37 |
| Tempo | 4:50–5:05 | 7:30–7:55 |
| Race Pace (Goal) | 4:44 | 7:38 |
One notable feature of this pace chart is that the tempo pace range of 4:50 to 5:05 per kilometer sits just above goal race pace at its faster end. This is intentional. The 10 km tempo runs in Weeks 7, 9, and 10 at 4:50 per kilometer are run at just 6 seconds per kilometer above race pace over a distance nearly half the full race. Completing these sessions consistently is the primary evidence that your lactate threshold has risen to the level sub-1:40 requires.
The Long Run Progression
The long run is the structural foundation of every half-marathon training plan, and in this plan, it grows with deliberate purpose. Long runs begin at 60 minutes in Week 1 and reach 20 km in Week 10, covered at an easy, low heart rate pace on each occasion.
The key step-up comes in Week 6, when the long run extends to 15–18 km. At this distance, you begin to encounter the glycogen demands and muscular fatigue that the back half of a half-marathon will present. The 18 km long runs in Weeks 7 and 9 consolidate this adaptation. The 20 km run in Week 10 the longest training run of the entire plan. It ensures you arrive at the start line having already run close to the full race distance under controlled conditions three weeks before race day.
All long runs in this plan are run at an easy, low heart rate pace. This is not incidental. Long, slow running builds mitochondrial density, fat oxidation capacity, and the structural muscular endurance that determines how well you hold 4:44 per kilometer in the final 4 kilometers of the race when aerobic reserves are depleting, and muscular fatigue is highest. As Ilya notes for Week 8: “Holding back now ensures your body absorbs the hard work from earlier weeks.” The same principle applies to every long run in the plan.
Core Strength in a Half-Marathon Plan
This plan does not include scheduled core sessions, but supplementary strength work is strongly recommended for runners targeting sub-1:40. A 1:40 half-marathon takes approximately 100 minutes of continuous running. The postural demands over that duration are significant, and the cost of postural breakdown in the final 20 minutes is measurable in pace.
Adding 10 to 15 minutes of core work, abs, back, and hip strength after easy runs two to three times per week, particularly during the Build and Sharpen phases, builds the muscular resilience to maintain upright posture, efficient hip extension, and controlled arm drive when fatigue is highest. Runners who include this work consistently report a noticeable improvement in their ability to hold form and pace in the final 5 kilometers, exactly where sub-1:40 races are won or lost.
Race Day Execution
Ilya’s Week 12 coach note contains the clearest race day instruction in the plan: “Start controlled, settle into rhythm, and stay confident. When it gets tough, remember the weeks of preparation you are ready.”
For sub-1:40, this means running the first 5 kilometers at 4:47 to 4:50 per kilometer, three to six seconds per kilometer slower than goal pace. At the start line with fresh legs and race-day adrenaline, this will feel conservative. It is correct. Restraint in the opening kilometers preserves glycogen and delays the onset of meaningful lactate accumulation, leaving you with genuine physical resources for the second half.
From kilometer 5 to kilometer 15, settle into the exact goal pace of 4:44 per kilometer. This should feel controlled and sustainable. If it feels genuinely easy, hold back. If it already feels difficult, ease off rather than forcing it; there are still 6 kilometers to race, and the cost of going too hard too early is severe at this pace.
From kilometer 15 onward, increase effort gradually and let pace respond. A runner who has been disciplined in the first 15 kilometers will have something real left in the final 6. A 50:00 first half and a 49:59 second half is a near-perfect sub-1:40 execution.
What You Need Before You Start
GPS Watch
The 1km interval sessions and the 10 km race-pace run in Week 10 require precise pace feedback across sessions lasting 4 to 60 minutes. At 4:44 per kilometer, a 10-second drift in pace is the difference between training at the right stimulus and overreaching. A GPS watch with real-time pace display, lap splits, and interval programming is essential for executing these sessions correctly.
For runners who want the most complete picture, including race predictor functions, suggested daily workouts, and training readiness scores, the Garmin provides those tools at the volume and intensity level this plan targets. Best GPS Watches For Running
Running Shoes
Weekly volumes reach 64 kilometers in peak weeks with long runs extending to 20 kilometers. A well-cushioned daily trainer handles the easy runs, long runs, and midweek mileage that make up the majority of weekly kilometers. A lighter, more responsive shoe is worth reserving for Tuesday interval sessions, Friday tempo and race-pace sessions, and race day itself. Best Running Shoes
Recovery and Nutrition
At 45 to 64 kilometers per week across 12 weeks, cumulative fatigue is the primary risk to consistent training. Three tools make a measurable difference at this volume.
A foam roller used after Tuesday intervals and Friday tempo and race-pace sessions reduces next-session stiffness. Magnesium supplementation before sleep supports muscle recovery during the demanding Build and Peak weeks, particularly Weeks 7 and 10.
For long runs of 75 minutes or more, which applies from Week 6 onward, taking on 30 to 60 grams of carbohydrate per hour prevents the glycogen depletion that compromises both long run quality and the training sessions that follow. Practice your race-day fueling strategy during long runs so it is familiar and tested before race morning. Best Electrolytes For Runners / Best Massage Guns
How to Get the Full Plan
This article explains the structure, methodology, and key training sessions of the Half Marathon Sub-1:40 plan. The complete 12-week schedule, including every session across all 12 weeks, full warm-up and cool-down routines, running drill guidance, all pace charts, and Ilya’s coach notes for every week, is available as a downloadable PDF.
About the Coach
This plan was created by Ilya Tyapkin, a professional marathon runner who represented his country at the 2016 Rio Olympic Games. Ilya coaches runners of all levels through structured training programs built on the same principles used in elite distance running. All training plans on esenbay.com are designed and reviewed by Ilya directly.
Frequently Asked Questions
The 10 km tempo runs feel very demanding — is that normal?
Yes. A 10 km tempo at 4:50–5:05 per kilometer is one of the most physiologically demanding sessions in a half-marathon plan. It is supposed to feel hard but controlled you should be able to complete full sentences, but only just. If you cannot complete the full distance at the prescribed pace, start at 4:55–5:00 per kilometer and build. Completing the full distance at a controlled effort matters more than hitting the exact pace target on the first attempt.
What if I miss a session?
Skip it and move on. Do not try to double up or compensate. Consistency across 12 weeks delivers the adaptation this plan is designed to produce. The Week 8 recovery week is specifically designed to absorb the minor interruptions that occur in any real training block without compromising the plan’s overall progression.
Do I need to fuel during long runs?
From Week 6 onward, when long runs reach 15 to 18 kilometers, carbohydrate intake during the run becomes important. At an easy pace, a 90-minute run will begin to deplete glycogen stores. Practice fueling during these runs with gels, chews, or sports drinks at 30 to 45 minute intervals so that race day nutrition is familiar and tested rather than an experiment on the most important day of the training block.
