Sub-2 Half Marathon Training Plan: The Complete UK Guide (12 Weeks, 2026)
9:09/mile pacing for 13.1 miles. 12 weeks of structured running plus strength. The honest UK plan.
- Sub-2 half marathon means running 9:09/mile (5:41/km) for 13.1 miles. UK median is 2:10, so sub-2 sits roughly top 35% of finishers.
- The 12-week plan asks for 4 runs a week, building from 18 miles a week to a peak of 32 miles, plus 2 strength sessions.
- For hybrid trainers, Edge builds a coach-made sub-2 plan within 24 hours and pushes every structured workout to your Garmin, Coros, or native Apple Watch app.
Who this plan is for (the honest prerequisites)
A sub-2 half marathon is not a beginner goal. It sits in the middle of the UK pack, roughly the top 35% of finishers, and it asks for a real running base before week one of any plan. If you skip the base building, the workouts will feel impossible and the injury risk goes up fast.
To follow this plan safely, you should tick all four of these boxes:
- Comfortable running 4 days a week. Not 'I could probably manage it.' Already doing it for 6 to 8 weeks.
- Current 10K time under 53 minutes. This is the rough fitness floor. If your 10K is 55 minutes or slower, you are probably better off chasing a 10K PB first, then coming back to this plan.
- Current weekly mileage between 18 and 22 miles. The plan starts here. If you are running 10 miles a week right now, you need a 6 week base building phase first.
- A long run of 7 to 8 miles already in the legs. The plan builds from there to a 12 mile peak long run.
If you tick three of four, you can probably start with the first 2 weeks extended into 4 weeks. If you tick two or fewer, please do a base building block first. We have a beginner half marathon plan linked at the end of this guide.
The sub-2 maths: why 9:09/mile is the magic pace
Sub-2 hours means crossing the line in 1:59:59 or faster. The half marathon distance is 13.1 miles, or 21.1 km. The exact average pace you need is 9 minutes 9 seconds per mile, or 5 minutes 41 seconds per kilometre.
Here is what that looks like in plain numbers:
- Per mile: 9 minutes 9 seconds. Across 13.1 miles, that totals 1 hour 59 minutes 53 seconds.
- Per kilometre: 5 minutes 41 seconds. Across 21.1 km, that totals 1 hour 59 minutes 56 seconds.
- 5 km split: about 28 minutes 25 seconds. You should pass 5 km feeling well within yourself.
- 10 km split: about 56 minutes 50 seconds. If you pass 10 km in 57 minutes flat, you are still on for sub-2.
- 10 mile split: about 1 hour 31 minutes 30 seconds.
The plan trains you to run 9:09/mile and feel like you have a gear left. If 9:09 is your maximum effort with 3 miles to go, the wheels come off and sub-2 slips away. The big idea of the next 12 weeks is to make 9:09 sit comfortably inside your aerobic ceiling.
The full 12-week sub-2 plan (week by week)
Four runs a week. Two strength sessions a week. One full rest day. The plan assumes you race in week 12 on a Sunday.
| Week | Tue (quality) | Thu (tempo) | Sat (easy) | Sun (long) | Total |
|---|---|---|---|---|---|
| 1 | 5 x 800m at 5K pace | 4 mi steady | 3 mi easy | 7 mi easy | 18 mi |
| 2 | 6 x 800m at 5K pace | 4 mi steady | 3 mi easy | 8 mi easy | 19 mi |
| 3 | 4 x 1km at 10K pace | 5 mi (3 at 9:09 pace) | 4 mi easy | 9 mi easy | 22 mi |
| 4 | 5 x 1km at 10K pace | 5 mi (4 at 9:09 pace) | 4 mi easy | 6 mi (cutback) | 20 mi |
| 5 | 3 x 1 mile at 10K pace | 6 mi (4 at 9:09 pace) | 4 mi easy | 10 mi easy | 24 mi |
| 6 | 4 x 1 mile at 10K pace | 6 mi (5 at 9:09 pace) | 5 mi easy | 11 mi easy | 27 mi |
| 7 | 2 x 2 mile at half pace | 7 mi (5 at 9:09 pace) | 5 mi easy | 12 mi easy | 29 mi |
| 8 | 6 x 1km at 10K pace | 7 mi (5 at 9:09 pace) | 5 mi easy | 8 mi (cutback) | 26 mi |
| 9 | 3 x 1 mile at 10K pace | 8 mi (6 at 9:09 pace) | 6 mi easy | 12 mi (last 3 at 9:09) | 32 mi |
| 10 | 10K tune-up race or 6 mi at 9:00 pace | 6 mi easy | 5 mi easy | 10 mi easy | 28 mi |
| 11 | 3 x 1km at half pace | 5 mi (3 at 9:09 pace) | 4 mi easy | 8 mi easy | 22 mi |
| 12 | 3 mi easy with 4 strides | 2 mi shakeout | Rest | RACE: 13.1 mi | 18 mi |
Notice the build pattern. Week 9 is the peak at 32 miles. Weeks 11 and 12 are the taper. Weeks 4 and 8 are cutback weeks where the long run drops by 30%, which gives the legs space to absorb the load.
The four key workouts, explained
Easy run (pace: 10:30 to 11:15 per mile)
Easy means conversational. You should be able to chat in full sentences. Most runners chasing sub-2 run their easy days too fast, then arrive at the quality sessions cooked. If 10:30/mile feels too slow, that is the point. Easy runs build the aerobic base and let the body recover between hard days.
Tempo run (pace: 8:50 to 9:20 per mile)
The tempo run is the most important workout in this plan. You run at or slightly faster than goal half marathon pace for a sustained block, usually 3 to 6 miles. This trains your body to clear lactate at race pace. By week 9, you are running 8 miles total with 6 miles at 9:09/mile. If you can hit that session, sub-2 is realistic.
Intervals (pace: 7:45 to 8:30 per mile)
Intervals are short, hard reps at faster than race pace, with rest in between. Think 5 x 800m or 4 x 1 mile. The point is not to win the workout, it is to raise your VO2 max so that 9:09/mile feels relatively easy. Recoveries should be slow jogs, not a full stop.
Long run (pace: 10:00 to 10:45 per mile, with race-pace blocks late in the plan)
Long runs build durability. The first 8 weeks are pure easy aerobic miles. From week 9 onwards, you add race-pace finishes (the last 3 miles of a 12 mile run at 9:09/mile). This rehearses what fading feels like at race intensity.
Pace targets cheat sheet
| Effort | Per mile | Per km | Feel |
|---|---|---|---|
| Easy | 10:30 to 11:15 | 6:32 to 7:00 | Chat in full sentences |
| Long run base | 10:00 to 10:45 | 6:13 to 6:41 | Short sentences |
| Half pace (sub-2) | 9:09 | 5:41 | Comfortably hard |
| Tempo | 8:50 to 9:00 | 5:30 to 5:35 | Three to four words at a time |
| 10K pace | 8:20 to 8:35 | 5:11 to 5:20 | Hard, single words |
| 5K pace | 7:45 to 8:00 | 4:49 to 4:58 | Very hard, no talking |
Strength sessions: two a week, full body
Strength training is non-negotiable for sub-2 hopefuls. It protects against injury, improves running economy, and makes the final miles feel less catastrophic. Two sessions a week, 30 to 40 minutes each. Keep it simple and progressive.
Session A (Wednesday, lower body bias):
- Goblet squat: 3 x 8 reps
- Romanian deadlift: 3 x 8 reps
- Walking lunges: 3 x 10 each leg
- Single-leg calf raise: 3 x 12 each side
- Plank: 3 x 45 seconds
Session B (Friday, full body):
- Step-ups: 3 x 8 each leg
- Press up: 3 x 8 reps
- Bent over row: 3 x 10 reps
- Glute bridge: 3 x 12 reps
- Side plank: 3 x 30 seconds each side
Lift in the afternoon if you ran in the morning. Never do strength right before a quality run.
Taper logic (weeks 11 and 12)
The taper is where many runners panic and over-train. Trust the cutback. Across weeks 11 and 12, weekly volume drops by about 30% and then 45%, but the intensity stays the same. Short blocks at race pace keep the legs sharp without adding fatigue.
What changes in the taper:
- Total mileage drops from 28 (week 10) to 22 (week 11) to 18 including the race (week 12).
- Long run drops from 10 miles to 8 miles to the race itself.
- Intervals shrink from 1 mile reps to 1 km reps.
- Easy runs stay easy. Do not test how race pace feels in race week.
You should arrive at start line with springy legs and a slight feeling that you have not done enough. That is the right feeling.
Race day pacing: aim for a negative split
The single biggest reason UK runners miss sub-2 is going out too fast in the first 5 km. The crowd, the adrenaline, and the downhill start of many UK courses (looking at you, Royal Parks and Cardiff) make 8:40/mile feel easy at mile 2. Mile 11 then becomes a horror.
Plan a slight negative split. Aim for:
- Miles 1 to 3: 9:15/mile (settle in, do not chase)
- Miles 4 to 9: 9:09/mile (your goal pace)
- Miles 10 to 13.1: 9:00 to 9:05/mile (squeeze, do not sprint)
This gives you a buffer for water station congestion and a short hill or two. If you cross 10 km in 56:30 feeling smooth, you are perfectly placed.
Fueling during the race: gels every 4 miles
For a sub-2 effort you need carbohydrate on board. Aim for 30 to 60g of carbs per hour. In practice, that looks like one gel before the start, one at mile 4, one at mile 8, and a half gel at mile 11 if you fancy it.
Practice every gel you plan to race with on long runs from week 6 onwards. Race day is not the moment to try a new brand. Sip water at every station for 2 to 3 small swallows. More than that and you slosh.
Common reasons people miss sub-2
- Easy days too fast. Easy means easy. If you cannot speak in sentences, slow down.
- Skipping the long run. The 12 mile run with a race-pace finish in week 9 is the single most predictive workout. Do not skip it.
- Going out too fast. Mile 1 at 8:30/mile pace costs you mile 12 at 9:45.
- No strength. The legs collapse in the final 5 km without it.
- Carbs too low. Bonking from mile 9 is a fuelling failure, not a fitness failure.
- Race day shoes never tested. Wear the shoes for at least three tempo runs and one long run before race day.
How Edge fits in
This plan works on its own. You can copy the table into a notebook and tick weeks off. But many UK runners chasing sub-2 also lift, do a HIIT class on a Monday, and want their watch to actually buzz at the right pace.
That is where Edge fits in. Edge is built for hybrid trainers. A real coach hand builds your sub-2 plan within 24 hours of signup. From there:
- Every running session pushes to your Garmin or Coros as a structured workout, with intervals, target paces, durations, and recoveries. Completed sessions sync back automatically.
- If you wear an Apple Watch, the Edge native Apple Watch training app gives you the full workout experience from the wrist.
- Flexi Swap lets you move a session if life happens. Edge AI 30s answers form, fuelling, and pace questions in seconds. You can also message the coaches directly.
- General strength and mobility libraries with coach video demos sit alongside the running plan.
- 17,000+ UK members, free 7 day trial on 6 month and annual plans, from £19.99/month or £119.99/year.
Edge does not replace this plan. It builds you a personalised version of it and gets it onto your wrist.
Sub-2 Readiness Check + Pacing Calculator
Check your sub-2 readiness
Enter your numbers. The tool returns a readiness rating and your race-day splits.
Frequently asked questions
How fast is a sub-2 half marathon pace?
9 minutes 9 seconds per mile, or 5 minutes 41 seconds per kilometre, sustained for 13.1 miles. That gets you across the line in 1 hour 59 minutes 56 seconds.
Is sub-2 a good half marathon time in the UK?
Yes. UK median half marathon time sits at roughly 2 hours 10 minutes. Sub-2 puts you in the top 35% of finishers and is a recognised benchmark for committed amateur runners.
How long does it take to train for a sub-2 half marathon?
12 weeks if you already run 18 to 22 miles a week and have a 10K time under 53 minutes. If your base is lower, add a 4 to 6 week base building block first.
Can I train for sub-2 on 3 runs a week?
It is possible but harder. You lose flexibility around recovery and sessions. Four runs a week, with one quality, one tempo, one easy, and one long, is the most efficient setup.
Do I need a coach for a sub-2 half marathon?
No, this plan is enough on its own. A coach helps if you want personalisation, if your schedule keeps changing, or if you train alongside strength or HIIT. Edge offers coach built plans within 24 hours from £19.99/month.
What is the longest run on a sub-2 half marathon plan?
12 miles. You do not need to run the full 13.1 in training. Race day adrenaline and tapering bring the extra mile out of your legs.
