Pyramidal, Polarized, Threshold: Which Training Model?

What Is Training Intensity Distribution?

Training intensity distribution describes how an athlete splits their training time between easy, moderate, and hard efforts. It is one of the most critical factors in endurance performance — more important than total volume according to several studies (Seiler, 2010).

Three models dominate the scientific literature: pyramidal, polarized, and threshold. Choosing the right model can mean the difference between steady progress and months of stagnation. TrainingZones.io helps you understand these models to structure your training intelligently.

What Are the 3 Physiological Intensity Domains?

Exercise intensity divides into 3 physiological domains based on lactate thresholds (Seiler & Kjerland, 2006). Understanding these domains is essential before choosing a training model.

• Zone 1 — Below LT1 (lactate threshold 1): pure aerobic, fat oxidation, conversation is easy. This is base endurance — the foundation of every program.
• Zone 2 — Between LT1 and LT2: transition zone where lactate accumulates gradually. Tempo pace, marathon effort. Tiring but sustainable for 30-60 minutes.
• Zone 3 — Above LT2: high intensity, lactate accumulates rapidly. VO2max intervals, sprints. Sustainable for only a few minutes.

These 3 domains are the universal physiological foundation. Training models with 5 or 7 zones (Coggan for cycling, Daniels for running) subdivide these domains for practical precision, but the underlying logic remains the same.

Want to calculate your personal thresholds? Use our Heart Rate Zone Calculator to get your zones based on your maximum heart rate.

How Does the Pyramidal Model Work?

The pyramidal model is the most intuitive intensity distribution and the most commonly observed among elite endurance athletes during regular training (Esteve-Lanao et al., 2005).

The principle is simple: lots of easy volume, some tempo, very little high intensity. The distribution forms a pyramid shape.

• Zone 1: approximately 75% of training time
• Zone 2: approximately 15%
• Zone 3: approximately 10%

This model builds a solid aerobic base while including enough threshold work to stimulate adaptations. It is ideal for athletes who can train 8-15 hours per week and want steady, sustainable progress without overtraining risk.

What Is Polarized Training (80/20)?

Polarized training is the model that produced the greatest improvements in comparative scientific studies. Popularized by Stephen Seiler (2010), it follows the "80/20" principle: 80% easy, 20% hard, almost nothing in between.

• Zone 1: approximately 80% of training time
• Zone 2: approximately 5% only
• Zone 3: approximately 15%

The key insight: the tempo zone (between LT1 and LT2) generates a lot of fatigue for relatively little gain. By minimizing it, you recover better from your hard sessions and can accumulate more easy volume.

The landmark study by Stöggl & Sperlich (2014) compared 4 models over 9 weeks in trained athletes. Result: the polarized model produced the greatest improvements in VO2max (+11.7%), time at threshold, and time-trial performance.

This model is particularly effective in running, cycling, cross-country skiing, and rowing for intermediate to advanced athletes.

How Does the Threshold Model Work?

The threshold model concentrates work around the lactate threshold — the "sweet spot" zone in cycling, half-marathon pace in running.

• Zone 1: approximately 40% of training time
• Zone 2: approximately 50%
• Zone 3: approximately 10%

This model is popular among time-crunched athletes (6-8h/week). The reasoning: if you can't accumulate 15 hours of volume, you'd better maximize the threshold stimulus.

Caution: according to Stöggl & Sperlich (2014), this model is effective short-term (4-6 weeks) but increases the risk of overtraining and plateau over the medium term. The body adapts to the stimulus and gains stall. It must be alternated with volume phases.

Which Training Model Is Most Effective?

Based on the scientific literature, here is how the 3 models compare:

Pyramidal model

• Easy volume: very high
• Overtraining risk: low
• Time required: 10-15h/week
• Proven effectiveness: very good for building the base

Polarized model

• Easy volume: very high + high intensity is also high
• Overtraining risk: low
• Time required: 8-12h/week
• Proven effectiveness: the best according to Stöggl & Sperlich (2014)

Threshold model

• Focus: tempo/threshold dominant
• Overtraining risk: high
• Time required: 6-8h/week
• Proven effectiveness: good short-term, risk of plateau

What Is Training Periodization?

Training periodization describes how intensity distribution evolves over time. It combines with the models above to create a complete training plan.

Classic linear periodization (Matveyev): base volume → build intensity → peak → taper. The traditional model, simple and proven since the 1960s.

Block periodization (Issurin, 2010): concentrate one type of stimulus per 2-4 week block. Example: 3 weeks pure endurance, then 3 weeks threshold, then 3 weeks VO2max.

Reverse periodization: start with intensity, then build volume. Used in swimming and sometimes triathlon when competition is near.

Undulating periodization: vary intensity within each week (Monday easy, Tuesday VO2max, Wednesday tempo). Popular in strength sports.

The current trend among elite coaches often combines a polarized distribution with block periodization — alternating blocks with aerobic focus and blocks with intensive focus.

Which Training Model Should You Choose for Your Level?

There is no universal answer, but here are recommendations based on the research:

Just starting endurance sports? Begin with the pyramidal model. Build your aerobic base with 80% easy volume and some tempo work. This is the foundation everything else builds on.

Solid base but hitting a plateau? Switch to polarized. Cut the tempo, increase the intensity of your hard sessions. This is the model best supported by science for breaking through a plateau.

Limited time (less than 6h/week)? The threshold model can work for 6-8 weeks, but you must alternate with volume phases to avoid overtraining.

Preparing for a race? Use block periodization with a polarized base. Start with an aerobic block, then a threshold block, then a race-specific block.

Want to calculate your personalized training zones? Use our Heart Rate Zone Calculator for heart rate or our Running Zones Calculator for paces based on your MAS.

To track your zones in real time, a GPS watch with heart rate monitoring is essential. The Garmin Forerunner 265 or Coros Pace 3 offer excellent value for zone-based training — with built-in zone alerts.

References

• Seiler S (2010). What is Best Practice for Training Intensity and Duration Distribution in Endurance Athletes? Int J Sports Physiol Perform, 5(3):276-291.
• Stöggl T, Sperlich B (2014). Polarized Training Has Greater Impact on Key Endurance Variables than Threshold, High-Intensity, or High-Volume Training. Front Physiol, 5:33.
• Esteve-Lanao J et al. (2005). How Do Endurance Runners Actually Train? Med Sci Sports Exerc, 37(3):496-504.
• Seiler S, Kjerland GØ (2006). Quantifying Training Intensity Distribution in Elite Endurance Athletes. Scand J Med Sci Sports, 16(1):49-56.
• Issurin VB (2010). New Horizons for the Methodology and Physiology of Training Periodization. Sports Med, 40(3):189-206.