Sub-3:30 Marathon Pace Kilometers

Workout - Sub-3:30 Marathon Pace Kilometers

• 12min @ 6'15''/km
• 6 lots of:
  • 1.0km @ 5'00''/km
  • 1min 30s rest
• 10min @ 6'30''/km

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This breaks down “How to Go from a 4:15 Marathon to Sub-3:30”, a video from Lee Grantham worth watching in full. The key workout is below so you can try it today.

Key points

• Before jumping in, work out where you’re starting: current weekly mileage, your longest run recently, and what speed work you’ve done. This sets the stage for everything that follows.
• A 36-week training arc (roughly nine months) slowly builds volume, extends your long runs, and introduces faster intervals, without asking your body to absorb too much risk at once.
• Speed work centers on interval repeats done at or around your marathon pace (about 5 min/km or 8 min/mile).
• Long runs begin at an easy, conversational effort and progress toward marathon-specific work. You’ll build up to 12-15 miles (20-24 km) before layering in faster segments.

Workout example

• Interval session (once weekly):
  • Easy 10-minute warm-up
  • 6 x 1 km at marathon pace (5 min/km) with 60 seconds recovery, or 12 x 500 m with 60 seconds recovery. As you build fitness, shift toward 2 x 3 km or 3 x 2 km repeats.
  • Easy 10-minute cool-down
• Progressive long run (once weekly):
  • Begin with 10 km at an easy, relaxed pace (zone 2).
  • Run 6-10 km at marathon pace minus 10-20%.
  • Finish the last 6-10 km at true marathon pace.
  • Add roughly 10% more distance each week, targeting 12-15 mile (20-24 km) long runs before finishing them at race pace.

Practical tips

• Don’t jump your weekly mileage by more than 10% week to week. Injury prevention matters more than a faster calendar.
• Rotate between road, trail, and treadmill running to spread the impact load.
• The formula is straightforward: show up consistently, stay disciplined, and move forward without rushing.
• Adjust paces to match your current fitness and goals using the Pacing app.

Closing note

Take this plan, dial in the paces for where you are now, and stick with it. Use the Pacing app to set everything up.

References

• How to Go from a 4:15 Marathon to Sub-3:30 - YouTube (YouTube Video)