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Sub 4:00 Marathon Training Plan

This 16-week plan is designed to take a recreational runner with a solid base and guide them to a sub-4 hour marathon. The training builds progressively across four phases - base, development, sharpening, and taper - using a polarised approach that prioritises aerobic development alongside structured threshold work. The plan is built on the principle that most recreational marathon runners run too hard too often. It will feel conservative early, and that is intentional.

Who This Plan Is For

  • Runners who have completed at least one marathon and are targeting a sub-4 hour finish

  • Runners who have not yet raced a marathon but have consistent running history and a recent half marathon time of 1:50 or faster

  • Athletes training around a full-time work schedule - the plan is designed for five sessions per week with one optional sixth session

  • Self-coached runners who want structured, data-driven sessions rather than a simple mileage schedule

Entry Requirements

  • Able to run continuously for 90 minutes at a comfortable aerobic pace

  • Current weekly mileage of at least 25-30 miles (or equivalent in kilometres)

  • A recent half marathon time of 1:50 or faster, or a 10k time of 50 minutes or faster

  • No current injury preventing consistent running

  • A GPS watch capable of tracking pace and heart rate is strongly recommended

Plan Specifications

Weekly Training Hours                         6-8 hours per week at peak (weeks 10-13).

                                                                 Base phase: 4-5 hours.

                                                                 Taper: 3-4 hours.

 

Plan Length                                            16 weeks, including a 3-week taper

 

Delivery Platform                                  TrainingPeaks (structured workouts with targets)

 

Sport                                                       Running

Key Sessions Included

  • Weekly long run, building from 16 to 32 kilometres, with structured pace targets in the final weeks

  • Threshold intervals - typically 4-6 × 1 mile at threshold pace with recovery jogs

  • Easy aerobic runs in Zone 1-2 (the majority of weekly volume)

  • Marathon pace practice - progressive long runs with the final 8-12 kilometres at goal race pace

  • Optional easy cross-training session (cycling or swimming) for active recovery

  • Race-week shakeout sessions and pre-race routine guidance

What You Get

  • Full 16-week structured plan loaded directly into your TrainingPeaks account

  • Every session with specific targets - pace zones, heart rate ranges, duration, and session purpose notes

  • Progressive long run schedule with race-pace practice built in

  • Three-week taper with clear guidance on maintaining sharpness without adding fatigue

  • Race week schedule including shakeout runs and pre-race day routine

  • PDF quick-reference guide: race day pacing strategy, fuelling framework, and how to read your TrainingPeaks data

How It Works - TrainingPeaks Delivery

  • After purchase, you will receive an email with a link to connect the plan to your TrainingPeaks account. If you don't already have a TrainingPeaks account, you can create one for free - the free tier is sufficient for this plan.

  • Once connected, every session will appear in your TrainingPeaks calendar on the correct day, with structured workout targets including pace zones, heart rate zones, duration, and session notes.

  • Sessions sync automatically to Garmin, Wahoo, Apple Watch, and most other GPS devices via the TrainingPeaks app. You train to the targets on your device - no need to memorise sessions or carry notes.

  • The plan starts from the date you choose at setup. If you have a specific race date, set that in TrainingPeaks and the plan will align automatically.

Coaching Instead?

If you'd like a coach to adapt this plan to your life, review your sessions, and support you through to race day, Essentials Coaching starts at £80/month for the first three months. Your training plan purchase price of £45 will be deducted from your first month's coaching fee if you upgrade within 30 days of purchase.

 

Explore coaching here.

DISCLAIMER

This training plan is designed for general educational purposes and is not a substitute for personalised medical or coaching advice.

Before beginning any new training programme, consult a qualified medical professional, particularly if you have any pre-existing health conditions, injuries, or concerns. The targets and progressions within this plan are guides - if at any point training causes pain, illness, or excessive fatigue, rest and seek appropriate advice.

By purchasing this plan, you accept responsibility for how you apply it to your own training.

Barbour Performance Systems accepts no liability for injury or illness arising from the use of this plan.

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