16-Week Marathon Plan (Sub 4 Hours and Finish Strong)

Q: How many kilometers should I run to prepare for a marathon?

Most recreational runners do well with peak weeks around 45-65 km and long runs up to 28-32 km.

Q: Is a sub-4 marathon realistic?

Yes. It is realistic for runners who already run 10 km regularly and follow a structured plan with long runs, quality and recovery.

Q: How many days per week should I train?

Most runners train 4 to 5 days per week, including one quality workout, one long run and one or two rest days.

Q: What pace do I need to break 4 hours?

The target average pace is about 5:40 min/km, which is around 9:07 min/mile.

Introduction

Running a sub-4 marathon means covering 42.195 km at around 5:40 min/km (9:07 min/mi). It is demanding but realistic with structure and consistency.

This plan is built for runners who already run 10K, want to prepare their first marathon and aim to finish strong, not just survive the final miles.

Running training session — Aerobic base + consistency are the foundations of a sub-4 build.

Plan explained

The plan progresses in five clear blocks:

Weeks 1-4: adaptation.
Weeks 5-8: volume build.
Weeks 9-12: long-run focus.
Weeks 13-15: peak training.
Week 16: taper before race day.

Target pace: around 5:40 min/km on race day.

Marathon quality workout — One quality session per week improves running economy and pace control.

16-week plan

Week	Easy run	Quality workout	Long run	Rest days
1	6-8 km Z2	6x400 m	12 km	2
2	7-8 km Z2	5x3 min hard	14 km	2
3	8 km Z2	Tempo 5 km @ 5:35	16 km	2
4	6 km cutback	8x200 m	12 km	2
5	8-9 km Z2	5x800 m @ 5:05	18 km	1-2
6	9 km Z2	Tempo 6 km @ 5:35	20 km	1-2
7	9-10 km Z2	3x2 km @ 5:25	22 km	1
8	7 km cutback	10x400 m @ 5:00	18 km	2
9	10 km Z2	Progression 10 km	24 km	1
10	10 km Z2	5x1 km @ 5:15	26 km	1
11	10-12 km Z2	2x5 km marathon pace	28 km	1
12	8 km cutback	12x400 m @ 5:00	24 km	2
13	12 km Z2	6x1 km @ 5:10	30 km	1
14	10 km Z2	14 km with 8 km MP	32 km	1
15	8 km Z2	4x1 km @ 5:05	24 km	2
16	6 km very easy	3 km MP + strides	Marathon 42.2 km	3-4

Example week

Monday rest
Tuesday easy run
Wednesday intervals
Thursday easy run
Friday rest
Saturday medium run
Sunday long run

Long run training for marathon — Long runs build specific endurance and race-day confidence.

Training tips

Keep most miles easy: protect recovery and consistency.
Add strength twice a week: glutes, core and calves.
Practice fueling: use long runs to test hydration and gels.
Sleep matters: adaptation happens when you recover.

Recommended gear for marathon prep

Running shoes

Choose comfort and stability to handle high weekly mileage.

Shop shoes

Energy gels

Train your carb strategy before race day.

Buy gels

Running belt

Carry fuel and phone without bounce on long runs.

Shop belts

GPS watch

Track pace, load and zones to train with precision.

Buy GPS watch

Running socks

Lower blister risk and improve comfort in long sessions.

Shop socks

FAQ

How many kilometers should I run to prepare for a marathon?

As a practical range, many runners do well with 45-65 km peak weeks and long runs up to 28-32 km.

Is a sub-4 marathon realistic?

Yes. It is very realistic with 16 weeks of consistent training and smart pacing.

How many days per week should I train?

Most runners train 4 to 5 days per week with one quality workout and one long run.

What pace do I need to break 4 hours?

Around 5:40 min/km or 9:07 min/mi on average.

Race-day section

Start controlled, settle into your target pace, and prioritize fueling plus form in the final 12 km.

Marathon runners during race day — Race day execution is all about rhythm, fueling and patience.

Train with other runners

If you are preparing for a marathon, training with others can help you stay motivated.

You can find runners near you at:

https://www.correrjuntos.com

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