12-Week Marathon Plan is a 12-week running plan. This article combines the actual plan description with a example week from the stored workout entries.
What this plan is built for
Training logic and load
In the peak phase precision matters: key sessions count, but freshness and clean execution decide the outcome. The important part is not upgrading easy days into hidden hard days. The workout data shows which sessions are structured and which ones are intentionally simple.
The plan contains 48 scheduled entries across 12 weeks. The sequence matters as much as the total hours: hard, technical, or long workouts only work when the surrounding days allow you to absorb them.
Example week: Week 5
This week is not a generic template. It is built from the actual training plan entries, and the workout charts use the stored workout data.
No scheduled workout in this real plan week. Use the day to absorb the load and arrive fresh for the next session.
60 min @ 75% | 4x 0 min on / 1 min easy
The goal is to optimize fat metabolism and to perfect running technique in a fatigued state with the strides at the end.
No scheduled workout in this real plan week. Use the day to absorb the load and arrive fresh for the next session.
15 min @ 75% | 6x 4 min on / 4 min easy | 10 min @ 70%
The goal is to optimize race pace and develop pace endurance, as well as a feel for race pace.
60 min @ 75%
Calm base run This run primarily serves to optimize fat metabolism. Accordingly, it should be run more relaxed than intensely.
No scheduled workout in this real plan week. Use the day to absorb the load and arrive fresh for the next session.
1:30 h @ 75% | 20 min @ 94% | 10 min @ 97% | 10 min @ 65%
Primarily a calm base run that becomes progressive towards the end. This run primarily serves to optimize fat metabolism, as well as to develop pace endurance towards the end.
How to read the workout charts
The chart is based on the workout data: longer segments take more width, higher intensities sit higher, and harder work is marked with stronger colors. For swim or distance-based segments, the graphic represents the planned sequence rather than GPS data.
Practical execution
What to watch
- Execute the key days precisely instead of making the easy sessions faster.
- Use the plan description as context: equipment, fueling, mobility, and realistic threshold values are part of the training.
- When life or fatigue adds pressure, trim secondary work first and keep the most important session stable.
Training effect
Executed well, the plan improves your ability to absorb the intended stimulus repeatedly. Depending on sport and phase, that means more aerobic stability, better pace durability, stronger technique under fatigue, or more confidence at target effort.