You need 9:09 per mile for 26.2 miles to break four hours. Most runners who do it train four days a week and average about 32 miles, not the 50 a lot of plans demand.
That’s 5:41 per km. Translation: you don’t need to be fast. You need to be steady for a long time.
The sub-4 marathon training plan starts with a pace check
Four hours over 26.2188 miles works out to 9:09 per mile. Your watch usually records a bit extra, so aim for 9:00 to 9:05 on the display. One runner who finished in 3:59:38 saw a 9:02 average.
A quick fitness check helps. A 1:56:10 half marathon is roughly the same fitness as a 4:00 marathon. One coaching source wants a recent half under 1:55 before you start. You should also be running three or four days a week and have a recent 10 to 12 mile run.
Use weeks 1 to 4 as a go/no-go test. If 22 miles a week and a 10 to 12 mile long run feel manageable, keep going. By the peak, the plan asks for long runs of 18 to 20 miles. If those first weeks already feel hard, extend your base by a month instead of squeezing it into 16 weeks. Starting a block already tired leaves no room to absorb the hard weeks.
Sub-4 finishers run about 32 miles a week
A Strava analysis of 119,452 runners and 151,813 marathons gives us real numbers. It’s a secondary summary, so treat the exact figures as close, not exact.
| Group | Weekly miles | Peak long run |
|---|---|---|
| Sub-3 (men) | about 60 | 19-20 mi |
| Sub-4 finishers (all) | about 32 (about 4 runs) | 18-20 mi (3:30-4:00 bracket) |
| 4:00+ bracket | 22-28 (3-4 runs) | 16-20 mi |
Look at the last column. Peak long runs barely change across brackets. Weekly volume does. In short: the long run gets you to the start line, and the weekly miles decide your time.
Another dataset of 150,000 runners, from the Marathon Handbook, found 4:00 to 4:30 finishers averaged only about 20 miles a week. Across all runners, the mean was 28 miles over 3.6 run days, with a 12 mile average long run and a 3:50 mean finish. The 4:00+ group ran 50 to 60% of its miles easy, with zero or one hard session. So 32 isn’t a wall. It’s a typical number.
Think of weekly mileage like a savings account. Each easy run is a small deposit. One giant deposit before race day buys you nothing.
Why your easy runs are too fast
Most runners run easy days too hard. Then they run hard days too easy. Everything lands in the gray middle.
In a 2007 study of 12 sub-elite runners, one group ran 80.5% of their training at low intensity. The other ran 66.8%. After five months, the first group cut 157 seconds from a 10.4 km race. The second cut 121.5 seconds. In short: more truly easy running gave about 29% more improvement.
A separate 2014 study of 48 well-trained athletes backed the idea. The best group did mostly easy running (68%) plus a block of very hard work (26%). They raised VO2peak by 11.7%. Plans heavy on threshold work gave minimal gains. These athletes were fitter than a typical 4-hour marathoner, so use it as a direction only.
Your body doesn’t care about your ego. For sub-4, keep easy runs at 10:10 per mile or slower. That’s one minute off goal pace, a common coaching rule rather than trial data.
Easy means easy.
A 16-week sub-4 marathon schedule
This table is a stylized example, not a research result. Adjust it to your life.
| Week | Miles | Long run | Quality session |
|---|---|---|---|
| 1 | 22 | 10 | Easy strides |
| 2 | 24 | 11 | Easy strides |
| 3 | 26 | 12 | Easy strides |
| 4 | 21 | 9 | Recovery week |
| 5 | 28 | 13 | 2 mi tempo |
| 6 | 30 | 14 | 3 mi tempo |
| 7 | 32 | 15 | 4 mi tempo |
| 8 | 26 | 11 | Recovery week |
| 9 | 32 | 16 | 4 mi at 9:09 |
| 10 | 34 | 17 | 6 mi at 9:09 |
| 11 | 36 | 18 | 6 mi at 9:09 |
| 12 | 29 | 12 | Recovery week |
| 13 | 36 | 20 | 8 mi at 9:09 |
| 14 | 38 | 16 | 6 mi at 9:09 |
| 15 | 22 | 10 | Short, sharp 9:09 miles |
| 16 | 14 plus race | 3 easy | Race: 26.2 |
Recovery weeks are low on purpose. The rebound looks big, but each build week only sits a few miles above the last one. Week 9 matches week 7. Week 13 matches week 11.
Weeks 1 to 4 are the base block. Weeks 5 to 8 add tempo. Weeks 9 to 14 build marathon-pace running inside your long runs. Easy days fill the rest.
Long runs and marathon-pace segments
Run most long runs at about 10:00 to 10:30 per mile. Save 9:09 for the marathon-pace miles in weeks 9 to 14. Everything else stays at 10:10 or slower.
| Run type | Pace per mile | Pace per km |
|---|---|---|
| Marathon pace | 9:09 | 5:41 |
| Easy | 10:10-10:50 | 6:19-6:43 |
| Long run | 10:00-10:30 | 6:12-6:31 |
These paces are an illustrative estimate based on a VDOT-style calculator. Check them against your own recent race.
Fuel matters too. Aim for roughly 60 grams of carbohydrate an hour in the long runs, and practice up to 90 if your gut handles it. Going above 60 usually needs a mix of glucose and fructose. Train your stomach like a muscle. For race week, see the 3-day carbohydrate loading protocol.
What the final two weeks should look like
Your legs don’t get fitter in the last 14 days. They get fresh.
A 2007 meta-analysis of tapering found the best approach lasts two weeks. It cut volume by 41 to 60% and left intensity and run frequency alone. Translation: run less, but keep some pace in your legs and keep running most days. Many runners cut everything and show up flat.
With a 38-mile peak, that’s about 15 to 22 miles in the taper weeks. Weeks 15 and 16 above fit that range. AthleteOS applies this cut for you and runs a race readiness check in the last two weeks. For the full breakdown, read what to cut and keep in a marathon taper.
A runner who fixed her easy days
Meet Dana, 41. Her half marathon was 1:54, and she wanted a 3:55 marathon. She ran 18 miles a week, and her “easy” days were 9:40 per mile. She felt tired by every long run.
She slowed easy days to 10:30 and added a fourth run. Over 14 weeks she built to 34 miles a week with a 20-mile long run. Her legs stopped feeling heavy. She finished in 3:56. This is an example, not a real client.
She didn’t get faster by running harder. She got there by recovering better.
When your plan breaks
Plans break. You get sick or travel, and your sleep falls apart for a week.
Don’t cram the missed miles. As a common coaching rule, resume at about 70% of your normal volume and protect your long run. Here’s how to adjust by weeks to race.
Also watch for signs the plan is too much. A coaching rule of thumb: if easy runs sit five or more beats higher at the same pace for two weeks, back off. Seven warning signs your plan is too hard lays out the first change for each.
Missing one week won’t ruin 16.
AthleteOS builds your training plan around your race date. It moves the long run, trims volume, and explains each change in plain English. Start a plan on AthleteOS, or if you want a harder goal, check what a sub-3 marathon demands.