21k Negative-Split Progression

21k Negative-Split Progression

Workout - 21k Negative-Split Progression

  • 10min @ 6'00''/km
  • 7.0km @ 5'30''/km
  • 7.0km @ 5'15''/km
  • 7.0km @ 5'00''/km
  • 10min @ 6'30''/km
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Intro

Flora Beverley’s RUNNING TOP TIPS | MARATHON TRAINING | Your questions has solid content. Here are the key takeaways so you can run the workout right away. Watch the full video for the rest.

Key points

  • Negative-split strategy: split your long run into 7 km chunks, getting faster with each one (start around 5:30 min/km and build). A good way to dial in pacing.
  • Pre-run routine: glute activation, leg swings, hip openers, dynamic stretches. The longer the run, the longer the warm-up.
  • Injury prevention: avoid consecutive long runs, don’t skip warm-up or cool-down, stay light on the feet, avoid heavy heel strikes, and mix in low-impact work like gym, cycling, or swimming.
  • Nutrition and hydration: bring water and electrolyte salts. Gels work for long distances, test them first in training.
  • Beginners: start conversational and add distance slowly. After an injury, work back up with short 1-3 km runs before going long.
  • Motivation: podcasts, music, or a training partner. Explore Strava segments and local clubs for new routes. Mix in speed work and sprints.

Workout example

21.5 km (13.4 mi) negative-split run:

  1. Warm-up (5-10 min): glute bridges, lateral pulses, clams, leg swings, hip openers.
  2. Split 1, 7 km at ~5:30 min/km (relaxed, focus on form).
  3. Split 2, 7 km slightly faster (~5:15 min/km). Shorten your stride and land mid-foot.
  4. Split 3, 7 km faster still (~5:00 min/km, or faster if you’re feeling good).
  5. Cool-down: easy walk, hip-mobility drills, light upper-body stretch.

Tip: bring water, electrolyte solution, and a gel (only if you’ve tested it first). Use the Pacing app to dial in speeds for your current fitness.

Closing note

Try the negative-split method with paces adjusted to your current fitness. Add cross-training and music or podcasts to stay engaged. The Pacing app lets you customize the workout.

References

Inspired by Flora Beverley

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