Target pace: 5:41/km. The most famous psychological barrier in the popular marathon.
Completing a marathon in less than 4 hours is the goal of thousands of amateur runners. It means maintaining an average pace of 5:41/km for 42.195km — a feat that requires months of specific preparation.
Required Magic Index: approximately 43. If you run 5km around 24-25 minutes or 10km in 51-53 minutes, you have the aerobic base for the sub-4 marathon.
Find your current level
Enter a recent race time in the magic calculator to see where you stand and how far you are from your goal.
Aerobic base. 70-80% of workouts.
Specific marathon workouts.
Threshold. 25-35 min continuous.
30-35km at peak preparation.
The most important workout. Reach 30-32km 3-4 weeks before the race. Easy to moderate pace — not at marathon pace.
25-35 minutes at 5:15-5:25/km. Develops the anaerobic threshold needed to sustain marathon pace.
Peak between 60-80km/week. 4-5 workouts. Gradual progression over 16-20 weeks.
3 weeks of progressive volume reduction before the race. Fundamental to arrive rested.
Week 1 and the peak week of the top plan at each level, straight from the schedule. Volumes are the plan's prescription, in miles or minutes; your paces come in when you activate the plan with the magic calculator.
Intermediate · 16 weeks
| Day | Week 1 | Week 13 (peak) |
|---|---|---|
| Mon | Rest | Rest |
| Tue | Easy40 min | Easy50 min |
| Wed | Repetition24 min | Interval1h |
| Thu | Rest | Rest |
| Fri | Threshold35 min | Threshold50 min |
| Sat | Rest | Rest |
| Sun | Long1h10 | Long2h30 |
| Total | 2h49 · 4 workouts | 5h10 · 4 workouts |
Beginner · 16 weeks
| Day | Week 1 | Week 13 (peak) |
|---|---|---|
| Mon | Rest | Rest |
| Tue | Easy30 min | Easy45 min |
| Wed | Repetition25 min | Interval52 min |
| Thu | Rest | Rest |
| Fri | Threshold30 min | Threshold45 min |
| Sat | Rest | Rest |
| Sun | Long1h | Long2h20 |
| Total | 2h25 · 4 workouts | 4h42 · 4 workouts |
Advanced · 16 weeks
| Day | Week 1 | Week 13 (peak) |
|---|---|---|
| Mon | Rest | Rest |
| Tue | Easy45 min | Easy55 min |
| Wed | Repetition35 min | Interval1h |
| Thu | Easy40 min | Easy45 min |
| Fri | Threshold40 min | Marathon55 min |
| Sat | Rest | Rest |
| Sun | Long1h20 | Long2h40 |
| Total | 4h · 5 workouts | 6h15 · 5 workouts |
Sub-4 hours in the marathon is amateur running's most famous psychological dividing line. It's the mark that places you among marathoners who 'truly raced' — not just finished. It's a goal many marathoners chase for years.
5:41/km for 42.195km. It sounds doable when you're running 5km in the park. The marathon teaches you that km 32 is a completely different animal from km 10 — and sub-4h requires you to arrive at km 35 still able to hold the pace.
Race nutrition matters as much as training. Getting the fueling strategy wrong over the first 25km leads to the infamous 'wall' — where glycogen stores run out and performance plummets.
Aim for 30-60 g of carbohydrate per hour — in practice, one gel every 30-45 minutes, starting 45-60 minutes into the race. Don't wait to feel hungry: by then it's too late. Over 4 hours that is 4-6 gels.
There is no single right volume: sweat rates vary widely between runners. The goal is to lose no more than 2% of body mass during the race. Weigh yourself before and after long runs to calibrate how much to drink, and don't overdo it — too much water is a risk too (hyponatremia).
In the 36-48 hours before the race, raise carbohydrate to 10-12 g per kg of body mass per day. It's not an excuse to eat everything — it's topping up glycogen stores with foods you already digest well.
Going out too fast
The most common mistake. 5:30/km over the first 5km 'because I feel great' almost always turns into 6:30/km over the last 10km. The clock doesn't forgive poorly managed enthusiasm.
Long runs that are too slow
Long runs run far too slow (2+ min/km below marathon pace) don't prepare your muscles and metabolism for the actual demands of race pace. The final 10-15km of your long run should be closer to marathon pace.
Neglecting the taper
Cutting volume in the 2-3 weeks before the race isn't weakness — it's when your body absorbs the months of training. Runners who 'make up for it' with heavy workouts during the taper arrive at the start line already fatigued.
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