Volume vs. Intensity: The Great Coaching Debate

It's THE debate that constantly resurfaces in the running world. On one side, volume enthusiasts: running a lot, running often, building an unshakeable aerobic base. On the other, advocates for intensity: fewer miles, but more quality work. Both camps have their champions, their studies, and their results. So, who's right?

The Volume School: The Kenyan Model

Run a Lot, Run Together

Kenyan runners—especially those from Iten—are legendary for their training volume. The best log 110 to 140 miles per week, sometimes with three runs a day. The majority of this volume is done at a moderate pace, in groups, often on dirt roads at altitude.

Be warned, it's not all easy jogging: a Kenyan marathoner's 'easy' pace is still fast in absolute terms. But relative to their potential, it's indeed foundational endurance. Faster sessions exist—like the famous Tuesday fartlek in Iten—but they represent a small fraction of the total.

What it Develops

High volume stimulates deep aerobic adaptations: a more powerful heart, improved muscle capillarization, and peak running economy. VO₂max eventually plateaus, but specific endurance—your ability to sustain a high fraction of your VO₂max for extended periods—continues to improve with volume.

The Intensity School: The Norwegian Model

The Double Threshold

The Norwegian approach, popularized by Gjert Ingebrigtsen and his sons, is based on a different concept: two daily lactate threshold sessions, often involving long intervals (6 to 10 min) with ample recovery. The idea is to maximize time spent at an intensity that develops both VO₂max and lactate threshold.

The results have been spectacular: Jakob Ingebrigtsen has dominated the 1500m and 5000m, and other Norwegian athletes have shattered national records. The model quickly spread among recreational runners… sometimes with less discernment.

Beware of Copy-Pasting

The Ingebrigtsens have been training since childhood with meticulous coaching. They built their aerobic base for years before ramping up the intensity. Transposing the 'double threshold' to a 40-year-old runner logging 30 miles per week is ignoring the entire context. Personally, I believe the Norwegian method works for bodies that can handle the load—it's not a magic recipe.

What Science Says

Comparative studies are rare (it's hard to control all variables), but based on my readings, a few principles emerge:

• If you're a beginner, gradually increasing volume is enough to make progress. No need for intensity initially.
• If you're an intermediate runner (20 to 40 miles/week), a mix of both approaches—with a dominant volume component—seems optimal.
• If you're an advanced runner and have plateaued despite high volume, adding structured intensity can kickstart progress again.
• The target distance plays a huge role: the longer it is, the more volume takes precedence.

How to Apply This Practically

Rather than picking a side, most pragmatic coaches recommend a step-by-step approach:

1. First, build your volume — gradually increase your weekly mileage until you reach a stable plateau (at least 4 to 8 weeks).
2. Then, add intensity — one interval or threshold workout per week is enough for most of us.
3. Calibrate your paces — use your VDOT or lactate threshold as a reference point to avoid running in the 'grey zone'.
4. Monitor your recovery — your resting heart rate is a good indicator of accumulated fatigue.
5. Evaluate regularly — a test or a race time estimate every 6 to 8 weeks to measure your progress.