Marathon Pace Durability Test

Workout - Marathon Pace Durability Test

• 15min @ 6'00''/km
• 3 lots of:
  • 10min @ 5'00''/km
  • 1min rest
• 12min @ 6'00''/km

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This summary pulls from Lee Grantham’s “Achieving Your Marathon Goal Pace: Setting Realistic Yet Ambitious Targets.” It’s a solid watch — we’ve broken down the key workout so you can put it into practice this week. Check out the full video for the complete picture.

Key Points

• Build a SMART marathon goal: it needs to be specific, measurable, achievable, realistic, and time-bound. You’re aiming for a pace you can sustain through 10-minute blocks without crossing your lactate threshold.
• Start from your 5K performance. The progression goes: 5K → 10K → half-marathon → marathon.
• When you’re stuck at 1 minute, use short intervals. Build up duration gradually before attempting longer continuous blocks.
• The target is three 10-minute segments at goal pace (with 60 seconds recovery) before you tackle a full 15 km block in a long run.
• Keep your heart rate in check — stay below lactate threshold during all goal-pace work for safe adaptation.

Workout Example

1. Starting point – Can only do 1 minute at goal pace? Run 12 × 1-minute repeats at marathon goal pace with 30 seconds easy recovery between.
2. Building up – Once 1-minute repeats stop feeling hard, move to 3 × 10-minute repeats at marathon goal pace with 60 seconds easy running between.
3. Long-run version – When the 3 × 10-minute set feels solid, fit a 15 km continuous marathon-pace segment into a 25 km long run (structure: 5 km easy, 15 km goal pace, 5 km easy).
4. Next level – As fitness grows, increase to 4–5 blocks of 10 minutes, or extend the continuous marathon-pace work up to 20 km.

Practical Tips

• Keep tabs on heart rate; it should stay under your lactate threshold during goal-pace sessions.
• Don’t chase pace at the expense of effort — if your HR jumps while you’re hitting the target pace, dial back the interval and work back up.
• Treat each step as a durability test. Once 10 minutes feels comfortable, add another set or extend the block.
• Show up consistently week to week. The adaptation comes from repeating the work over time, and that’s what lets you hold marathon pace for the full distance on race day.

Closing Note Try these structured intervals this week. Adjust the lengths to match where you actually are, and log your pace in the Pacing app. As you expand the marathon-pace blocks step by step, your ambitious goal becomes something real. You’ve got this — now go run.

References

• Achieving Your Marathon Goal Pace: Setting Realistic Yet Ambitious Targets - YouTube (YouTube Video)