Nine minutes and nine seconds per mile. Hold that for 13.1 miles and you break two hours. That’s 5:41 per km, and it asks for fitness equal to a 26:05 5K.
Roughly 45% of half marathon finishers get there. This plan shows how, with a 12-week structure, four key workouts and a pace for every run.
What a sub-2 half marathon requires
The math is simple. Two hours is 7,200 seconds. Divide by 13.1 miles and you get 549 seconds per mile.
Your splits: 5K in 28:26, 10K in 56:52, 15K in 1:25:18. Miss the first 5K by 20 seconds and you’ll be chasing all day.
How common is it? A RunRepeat dataset of 35 million results from 28,000-plus races puts about 45% of finishers under 2:00. That’s about half of men and roughly one in five women. In short: it’s a real milestone, not a fringe one.
Equivalent 5K and 10K times: Riegel vs VDOT
You don’t need to race a half to know if you’re close. Use shorter races as a check.
The Riegel formula predicts a time at a new distance from a known one. It multiplies by the distance ratio raised to the 1.06 power. The VDOT model, from coach Jack Daniels and Jimmy Gilbert, turns a race result into a single fitness number. Translation: both are calculators that turn one race into a forecast for another.
Both give the same answer for a 2:00 half. Our calculations come out within about 12 seconds.
| Half marathon | 5K (Riegel) | 5K (VDOT) | 10K (Riegel) | 10K (VDOT) |
|---|---|---|---|---|
| 1:55 | about 25:00 | n/a | about 52:06 | n/a |
| 2:00 | about 26:05 | about 26:07 | about 54:24 | about 54:12 |
| 2:05 | about 27:10 | n/a | about 56:38 | n/a |
A 2:00 half is a VDOT near 36.5. These values are approximate and calculated by us, so check them against the official Daniels tables.
Riegel has a flaw. It runs optimistic for runners with low mileage. A fast 5K from 15 miles a week won’t carry you through 13.1. Endurance has to be there too.
Training pace bands from your goal time
Think of paces as gears in a car. You don’t drive everywhere in fifth gear. Each gear has a job, and using the wrong one wastes fuel.
Every band below comes from the 9:09 goal pace. They’re approximate. Use heart rate or effort if your watch drifts.
| Run type | Pace per mile | Pace per km | Purpose |
|---|---|---|---|
| Easy and long run | about 10:20-11:30 | 6:25-7:10 | Build endurance, recover |
| Marathon pace (reference) | about 9:35-9:45 | 5:57-6:04 | Steady long-run finish |
| Half marathon pace | 9:09 | 5:41 | Race rehearsal |
| Threshold | about 8:45-8:55 | 5:26-5:32 | Raise the pace you can sustain |
| 10K pace | about 8:44 | 5:26 | Strong aerobic effort |
| Interval (5K pace) | about 8:24 | 5:13 | Raise your ceiling |
| Repetition | about 7:50-8:00 | 4:52-4:58 | Speed and form, short reps |
Threshold pace is comfortably hard, a pace you could hold for about an hour in a race. Easy running should be slower than you think. If you can’t speak in full sentences, slow down.
How much should be hard?
Most of your running should be easy. The evidence is mixed, so here’s the honest version.
A 10-week study of 30 recreational runners compared a polarized plan with a plan stuck in the middle. Polarized means mostly easy running with a small share of truly hard work. The 10K gain was 5.0% for polarized and 3.6% for the middle group, about 41 seconds. That gap was not statistically significant overall. Among the 12 runners who followed their plan best, polarized won.
A second study found that runners training about 75-80% easy and 20-25% hard improved more than a group doing 45% easy, 35% moderate and 20% hard.
In short: the moderate middle is the weak spot. Keep easy days easy so hard days can be hard. For more on this debate, read polarized vs pyramidal training. To learn what easy feels like, see how Zone 2 builds the aerobic base.
The four key workouts
You need four workouts. Everything else is easy running.
- Threshold cruise intervals. Example: 3 x 10 minutes at about 8:50 per mile, with 2 minutes of jogging between. You get lots of time near threshold without grinding.
- Half-marathon-pace blocks. Example: 2 x 3 miles at 9:09, with 5 minutes easy between. This teaches your legs the exact rhythm of race day.
- 5K-pace intervals. Example: 5 x 4 minutes at about 8:24, with 3 minutes easy. Short, sharp and good for raising your ceiling.
- Progressive long run. Start easy near 10:50 per mile. Finish the last 2 to 3 miles near 9:50.
Heat lies. Pace on the watch doesn’t. When it’s hot, run these by effort.
A 12-week structure
Volume matters, but time on feet matters more. Cap the long run by time, about 2:00 to 2:15, not by distance. At an easy pace near 10:50, that’s about 11 to 12 miles.
The mileage and long-run figures here are coaching practice, not peer-reviewed results. Most goal-time plans use at least 25 miles a week as a floor.
| Week | Phase | Miles | Long run | Quality 1 | Quality 2 |
|---|---|---|---|---|---|
| 1 | Base | 24 | 8 | 6 x 20 sec strides | 15 min threshold |
| 2 | Base | 26 | 9 | 8 x 20 sec strides | 2 x 10 min threshold |
| 3 | Base | 28 | 10 | 5 x 3 min at 5K pace | 3 x 8 min threshold |
| 4 | Down week | 23 | 8 | Easy with strides | 20 min threshold |
| 5 | Build | 30 | 10 | 6 x 3 min at 5K pace | 3 x 10 min threshold |
| 6 | Build | 32 | 11 | 5 x 4 min at 5K pace | 4 x 8 min threshold |
| 7 | Specific | 34 | 11, progressive | 2 x 2 mi at 9:09 | 3 x 12 min threshold |
| 8 | Down week | 27 | 9 | Easy with strides | 20 min threshold |
| 9 | Specific | 36 | 12 | 2 x 3 mi at 9:09 | 5 x 4 min at 5K pace |
| 10 | Specific | 35 | 12, progressive | 2 x 4 mi at 9:09 | 4 x 10 min threshold |
| 11 | Taper | 26 | 9 | 3 mi at 9:09 | 4 x 3 min at 5K pace |
| 12 | Taper + race | 14 + race | Race: 13.1 | 4 x 1 min at 9:09 | Strides |
Taper in one sentence: a meta-analysis found the best result came from two weeks, with volume cut 41-60% and intensity unchanged. For the full details, see how long to taper for a half marathon.
Weeks 11 and 12 follow that rule. Week 11 is a 28% cut and week 12 is 61% before the race. Together they average about 20 miles against a 36-mile peak.
Race-day pacing
Don’t bank time. Go out at 9:09 or a few seconds slower, then settle. Even splits beat a hot start and a fade. Our guide on half marathon pacing and realistic goal pace covers the details.
When a week goes wrong
Life will hit. Here are the rules for dropping sessions, in order.
- Drop first: the 5K-pace session.
- Drop second: the threshold session.
- Protect: the long run and one half-marathon-pace workout.
- Missed a full week: repeat the last one, then continue.
- Sick with a fever: stop, then restart easy.
Skipping one workout costs almost nothing. Cramming two hard days costs a lot.
A sample case: Tom’s 2:00
Take a runner I’ll call Tom. This is an example, not a client story. He’s 37, ran a 2:07 half last spring and has a 5K near 27:30. He was running 22 miles a week.
He followed this structure. In week 6 he lost five days to a cold. He dropped the 5K-pace session, repeated the week and moved on. His easy pace got faster, from 11:05 to 10:35 per mile at the same effort. His threshold reps settled at 8:50 per mile, and he held them.
On race day he ran 9:11, 9:08, then 9:07 for the second half. He finished in 1:59:41. Steady beats fast-then-slow.
How AthleteOS adapts the plan
A static PDF can’t respond when your week breaks. AthleteOS builds a training plan from your goal time and a recent race, then puts every pace band on your workout calendar. If you miss a session or sleep badly, the AI coach swaps or drops a workout and writes a plain note explaining why. Before race day, the race readiness check shows whether your fitness and fatigue are where they should be.
If you’re building a lower-mileage schedule, see our 4-day half marathon plan for busy adults. Ready to try it? Start your 14-day trial.