Grantham's Sub-3 Marathon Foundation
Workout - Grantham's Sub-3 Marathon Foundation
- 10min @ 6'00''/km
- 5.0km @ 4'15''/km
- 1min rest
- 5 lots of:
- 500m @ 4'00''/km
- 1min rest
- 10min @ 6'00''/km
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Intro
“Can Anyone Break 3 Hours in the Marathon With This Method?” from Lee Grantham is worth watching. We’ve pulled out the core workout and key concepts so you can start this week. Watch the full video for the coaching details.
Key points
- Most runners get stuck on slow long distance or unstructured speed work. The answer is marathon-pace repeats mixed with faster bursts. For more on the science, see Mastering Interval Training: Science-Backed Workouts and How a Smart App Can Personalize Them.
- The structure: 5 km repeats at marathon goal pace (4:15/km for a 3-hour goal) with 60 seconds easy jog between, then 5 × 500 m at 10K speed (about 4:00/km). Top-end tempo matters, Mastering the 10K: Proven Training Plans, Pace Strategies, and How a Smart App Can Elevate Your Performance lays out plans and pacing.
- Use heart rate as your gauge: expect it to rise during the 5 km blocks, stabilise on the 500 m efforts, then drop during recovery.
- Add one 5 km repeat each week (start at 1, build to 6) while keeping the 500 m finishers each session.
- Round out training with easy runs, recovery days, and tempo work. Faster top-end work makes marathon pace feel easier, so build Mastering 5K Speed: Proven Interval Strategies to Cut Minutes off Your Time into your wider plan.
Workout example (sub-3-hour marathon)
Goal marathon pace: 4:15/km (6:52/mile).
| Session | Reps | Main set | Rest | Fast 500 m @ 10 k pace* |
|---|---|---|---|---|
| 1 | 1 × 5 km | 5 km @ 4:15 km | 60 s jog | 5 × 500 m @ ~4:00 km |
| 2 | 2 × 5 km | 5 km @ 4:15 km | 60 s jog | 5 × 500 m @ ~4:00 km |
| 3 | 3 × 5 km | 5 km @ 4:15 km | 60 s jog | 5 × 500 m @ ~4:00 km |
| 4 | 4 × 5 km | 5 km @ 4:15 km | 60 s jog | 5 × 500 m @ ~4:00 km |
| 5 | 5 × 5 km | 5 km @ 4:15 km | 60 s jog | 5 × 500 m @ ~4:00 km |
| 6 | 6 × 5 km | 5 km @ 4:15 km | 60 s jog | 5 × 500 m @ ~4:00 km |
Pick a 10K pace a few seconds quicker than your marathon pace. The goal is to make marathon effort feel easier.
Practical tips
- Keep the 60-second jog between repeats. It keeps heart rate up without tipping into exhaustion.
- Track your heart rate. If HR holds steady after the 500 m finishers, you’re recovering well.
- Build gradually. If 3 × 5 km feels too hard, stay at 2 × 5 km for another week.
- Taper over the final 2-3 weeks. Cut the volume but hold the pace. You want springy legs on race morning.
Closing note
Slot one of these workouts into this week. The Pacing app lets you plug in your target paces. Watch the full video on Lee Grantham’s channel for more.