Weekly Half-Marathon Training Structure: Scheduling Long Runs, Intervals, and Easy Runs

Introduction

Half-marathon training is not as simple as just “running more kilometers.” An effective weekly training structure requires consideration of: the types of training stimuli, recovery time between sessions, and the proportional distribution of different training intensities. Many runners hit a plateau not because they run too little, but because their intensity distribution is off—easy runs are too fast, interval runs lack sufficient intensity, or there simply aren’t enough recovery days.

The Golden Ratio of Training Intensity

Sports science research (including studies on world-class endurance athletes) consistently shows that the most effective training intensity distribution is:

• 80% low intensity (easy runs, long runs): a pace at which you can speak in full sentences
• 20% high intensity (intervals, Tempo): heavy breathing, unable to converse comfortably

This “80/20 Rule” applies to runners with a weekly mileage of 30 km or more.

Weekly Training Structures for Three Mileage Levels

Beginner (Weekly mileage 30–40 km, goal: finish or break 2:10)

Intermediate (Weekly mileage 40–55 km, goal: 1:45–2:00)

Advanced (Weekly mileage 55–70 km, goal: 1:30–1:45)

Key Principles

Long Run Scheduling

• The Sunday long run is the “centerpiece” of the weekly training plan; all other workouts serve it
• Scheduling an easy run the day before the long run (Saturday), rather than resting, helps you complete the long run under fatigue, simulating the feeling of the latter stages of a race
• The day after the long run (Monday) must be easy or rest; no high-intensity workouts should be scheduled

Spacing Between Intervals and Tempo Runs

• Allow at least 48 hours between two high-intensity workouts
• If you do intervals on Tuesday, the earliest you should schedule the next high-intensity workout is Thursday

Practical Advice

• Listen to your body: If you feel unusually fatigued or your legs feel heavy on a given day, downgrade to an easy run or rest entirely—don’t push through
• Don’t increase mileage every week: Every 3–4 weeks, schedule a “recovery week” and cut mileage by 20–30%
• Keep weekday workouts under 13 km: Except for the Sunday long run, keep the total distance of weekday workouts within 10–13 km to preserve energy for high-intensity sessions

Conclusion

A quality weekly training structure is the foundation of half-marathon success. Remember: most runners fail not because they don’t train enough, but because they don’t recover enough. Designing a training week you can sustain for 12–16 weeks is far more valuable than any brilliant workout plan.

Related Reading

• 12-Week Half-Marathon Preparation Plan: Weekly Mileage and Intensity Distribution
• Intensity Distribution for Half-Marathon Training: The Best Arrangement of 2 Quality Sessions Per Week
• How to Calculate Running Training Volume: Weekly Mileage and Intensity Distribution Principles
• Half-Marathon Training Periodization: Transitions Between Base, Build, and Race Phases