80/20 Threshold Booster

Workout - 80/20 Threshold Booster

• 12min @ 9'15''/mi
• 2 lots of:
  • 2.0km @ 4'12''/km
  • 3min rest
• 12min @ 9'15''/mi

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Intro

That Running Guy put out an excellent breakdown of slow training and fast racing. We’re pulling out the key takeaways so you can test-drive this approach immediately. Watch the full video for deeper context on why this works.

Key Points

• The 80/20 split: Keep roughly 80% of your weekly distance in easy, aerobic running (Zone 2–3) and reserve the remaining 20% for harder efforts like tempo work, threshold runs, and intervals.
• Aerobic running taps fat as your fuel source, builds aerobic capacity, and cuts injury risk considerably.
• Higher-intensity work (your 20%) teaches your body to use glycogen more efficiently, builds pace, and sets you up for race-day breakthroughs.
• For masters runners or anyone juggling recovery constraints, this ratio stays manageable while still delivering gains in strength and speed.

Workout Example

• Easy runs (80%): Stick to a relaxed pace that keeps your heart rate in the aerobic zone (typically Zone 2–3 if you’re monitoring). A sample might be a 4-mile run at around 8:40/mi or whatever equivalent fits your fitness.
• Speed work (20%): Mix in sessions like:
  • Tempo or threshold repeats: For instance, 2 × 2 km at just under 5K race speed, with 2–3 minutes of easy jogging between.
  • Or pick any tempo or threshold session that feels “challenging yet doable” over 20–30 minutes.

Modify the exact distances and paces based on where you’re training and what you’re after.

Closing Note

Run with an 80/20 split for four weeks and pay attention to how you feel. The Pacing app lets you dial in your easy and hard-effort paces to match your own targets. Now get out there and crush those goals.

References

• WHY I RUN MY SLOW (TRAIN EASY) TO RACE FAST - YouTube (YouTube Video)