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Sub 3:30 Marathon Training Plan

The sub-3:30 marathon is a meaningful step up from sub-4, requiring a higher weekly mileage base, more consistent threshold training, and the ability to sustain 4:58/km for the full distance. This 18-week plan builds the aerobic capacity and race-specific fitness needed to hit that target, while remaining manageable for athletes training around a full work schedule. It assumes you are not a beginner to structured training and can execute sessions by effort and pace.

Who This Plan Is For

  • Runners with at least one marathon completed, targeting a significant personal best

  • Athletes with a current half marathon time of 1:37 or faster (ideally 1:35 or under)

  • Runners comfortable with 40–50 miles per week who want a structured build rather than just adding mileage

  • Athletes who have used heart rate or pace zones in training and understand why intensity distribution matters

Entry Requirements

  • Half marathon time of 1:37 or faster within the last 6 months

  • 10K time of 45 minutes or faster

  • Current consistent weekly mileage of 35–45 miles

  • Comfortable running at threshold pace for sustained periods without injury history concerns

  • GPS watch with heart rate monitoring strongly recommended; power-based running a bonus

Plan Specifications

Weekly Training Hours                         7–10 hours per week at peak.

                                                                 The plan includes 5–6 sessions per week, with                                                                        two quality sessions and one long run.

 

Plan Length                                            18 weeks, including a 3-week taper

 

Delivery Platform                                  TrainingPeaks (structured workouts with targets)

 

Sport                                                       Running

Key Sessions Included

  • Long runs building to 35 kilometres, with the final 8–14 kilometres at marathon goal pace

  • Threshold runs - sustained 20–40 minute efforts at lactate threshold pace

  • Cruise intervals - 3–5 × 2 miles at threshold with 90-second recovery

  • Marathon pace progression runs - mid-week runs finishing at or below target race pace

  • Easy volume in Zone 1–2, comprising approximately 80% of weekly mileage

  • Strides and form work embedded in easy days

What You Get

  • Full 18-week structured plan in TrainingPeaks with all sessions, targets, and notes

  • Pace zone calculator reference based on your current threshold pace

  • Long run schedule with race-pace integration from week 8 onwards

  • Race-specific preparation in weeks 14–15 before the taper begins

  • Race week plan and pacing band reference for 3:30 target

  • PDF guide: reading your TrainingPeaks performance management chart, taper management, and race day execution

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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