Marathon Pace Training: How Much MP and How to Build

The principle: you learn marathon pace in pieces

Running 42 km at marathon pace is the test, and you cannot train that exact effort every week. The method works in pieces: blocks of 4 to 6 km at marathon pace (MP), with short floats that keep you inside the effort. Over the weeks, the blocks lengthen, the float moves closer to MP and your long runs finish with more kilometers near race pace.

The paces in this guide start from a 3:08 marathon, 4:27/km, which matches a 40:00 10K runner. The percentages use that pace with the formula pace x (2 - percentage/100).

How much MP to train

The number depends on your level and how long you have been preparing. A rough guide for the biggest MP session:

Build the rest of the week around that session. A specific-phase week includes one marathon pace session and one long fast run at 90-95%, with 2 to 3 easy days between them. More MP adds fatigue and no specificity.

Block progression

Lengthen total work before you speed up. With MP at 4:27 and floats at 90% (4:54):

1. 3 x 4 km at 100% with 1 km floats. Work: 12 km. This is the first exposure, about 8 to 10 weeks before the race.
2. 3 x 5 km at 100% with 1 km floats. Work: 15 km.
3. 4 x 5 km at 100-101% with 1 km floats. Work: 20 km. It takes about 104 minutes including the floats.
4. 4 x 6 km at 101% (4:24) with 1 km floats at 89% (4:56). Work: 24 km. It takes about 2:00 including the floats. For advanced runners.

Two rules go with the progression:

• Lengthen first, speed up second. Move from 3 x 4 km to 4 x 5 km at the same pace before dropping below 4:26.
• Raise the float before the block. Once the block feels solid, raise the float from 89-90% toward 92-95% instead of running the blocks faster.

Long runs with an MP segment

Long runs that finish at marathon pace rehearse the last kilometers of the race on tired legs. A pattern for an intermediate runner:

• 24 km long run: 8 km easy at 85-90% + 16 km at 97-100%.
• 28 km long run: 10 km at 90% (4:54) + 18 km at 97-100% (4:35-4:27). It takes about 2:10.
• 30 km long run (advanced): 10 km at 92% + 20 km at 98-100%.

Run two or three of these, 2 or 3 weeks apart, never back to back. The last one falls 3 or 4 weeks before the race, and the taper starts after it.

For slower runners, measure by time. If the marathon takes more than 4 hours, cap the long run at 2:30-2:45 and the MP segment near 2 hours. Fewer kilometers for the same duration of effort protect your recovery.

Layout of a specific-phase week

One specific-phase week for an intermediate runner:

• Monday: easy run, 10 km.
• Tuesday: easy run, 12 km.
• Wednesday: MP session: warm-up + 4 x 5 km at 100% with 1 km floats at 90% + cool-down.
• Thursday: easy run, 10 km with 6 strides.
• Friday: easy run, 12 km.
• Saturday: rest.
• Sunday: long fast run at 90-95%, or a long run with an MP segment in alternate weeks.

That makes two key sessions with two easy days between them. Speed work at 105% belongs to the support phase, where it replaces the Wednesday session.

What to do about 110% and speed

In a marathon plan, 110% shrinks to strides and the occasional fartlek. Repetitions at 105% (half marathon pace) belong to the support phase, such as 10-12 x 1 km or 6 x 2 km. In the specific phase, long runs and MP blocks replace that speed work.

How to check that the pace is right

Marathon pace feels controlled in the first blocks and demanding in the last. Check three signs:

• Your breathing stays even in the first block and can speak short sentences.
• The 90% float feels like a real rest. If it does not, the block runs too fast.
• The last block comes out at the same pace as the first, within 2 or 3 s/km.

If the last block runs 10 s/km slower, your MP target sits above your fitness. Set the 100% 2% slower for the next session and raise it again when you finish a session without fading. A good reference is your recent 10K or half marathon result, which you can convert with the calculator.

Common mistakes

• Raising MP out of optimism. If a recent 10K points to 4:35, do not train at 4:20 because “it feels fine”. MP is the pace you can hold for 42 km today.
• Running MP in every long run. Most long runs sit at 90-92%. Save pure MP for three or four sessions.
• Forgetting fuel. Practice gels in every long session with an MP segment (see the long fast run guide).
• Stacking sessions. Leave two easy days between the MP session and the long run.

What next

Work out your marathon, half marathon and easy paces with the calculator. To get the sessions placed week by week, create your plan from the home page.