Polarized vs pyramidal vs threshold — which training philosophy fits you

Spend five minutes on this topic and you'll fall into a rabbit hole of papers, Twitter shouting matches, and Norwegian coaches arguing with New Zealanders. Let's cut to it: three intensity distributions, and when each one is right for you.

The setup: intensity zones

Compressed to three zones (there are technically 5 or 7 — three is enough here):

Low (Z1–Z2): under aerobic threshold. Conversational. ~75% max HR.

Mid (Z3): at aerobic threshold. Sub-threshold, marathon pace. ~83% max HR.

High (Z4–Z5): over lactate threshold. Intervals. >89% max HR.

The three philosophies argue about how much time you spend in each zone.

1. Polarized (80/0/20 — Seiler)

> "80% of training time in the low zone, 20% in the high zone, almost nothing in the middle."

The dominant approach in elite endurance today. Stephen Seiler put a name on it after analyzing how Scandinavian rowers and skiers actually train.

Why it works: the middle zone (sub-threshold) generates a lot of fatigue for not enough adaptation. The low zone builds an efficient aerobic base; the high zone hits VO2max. Skipping the "grey zone" maximizes adaptation per unit of fatigue.

Best for: athletes training ≥6 hrs/week, with some experience, prepping long races (half marathon, marathon, ultra). The runner who can do real Z2 long runs without losing patience.

2. Pyramidal (70/20/10 — classic)

> "More Z2 than Z3, more Z3 than Z4, descending pyramid."

It's what most intermediate runners do without knowing. Lots of Z2, some tempo (Z3), a sprinkle of intervals.

Why it works: gentle gradient of adaptation. The middle zone isn't the enemy — it builds running economy and sub-threshold lactate tolerance. Useful for distances raced near threshold (10K, half).

Best for: amateur athletes training 4–6 hrs/week, racing 10K through marathon. The distance where "comfortable but firm" is what you'll actually do on race day.

3. Threshold (Norwegian model — Ingebrigtsen)

> "Double threshold sessions 2–3 times a week in the low-mid zone (sub-threshold), almost no true Z4."

The Jakob Ingebrigtsen / Marius Bakken approach that's dominated middle distance for the past six years. Two threshold sessions per day (AM + PM) stack time in Z3-Z4 without crushing fatigue because each block stays subaerobic (RPE 6-7, not 8-9).

Why it works: maximizes time in the productive zone without destroying the nervous system. Requires lactate testing (a portable meter) or excellent intensity feel.

Best for: advanced athletes with ≥10 hrs/week, lactate metrics or deep RPE experience, chasing fast 5K–10K. Also for swimmers and cyclists who can double up without falling apart.

Which one do I pick?

Honest matrix:

| Your profile | Suggested philosophy |

|---|---|

| Just starting structured training, chasing a 10K PR | Pyramidal |

| ≥6 hrs/week, amateur ultra trail | Polarized or Lydiard (80%+ base) |

| Advanced, lactate metrics, focus on speed | Threshold (Norwegian) |

| Trail running with real vert | Polarized + dedicated vert sessions |

| Amateur road cyclist | Sweet-spot (Coggan) (pyramidal variant focused on P3-P4) |

| Triathlete (IM / Half) | Polarized with discipline split |

The mistake of philosophy wars

Twitter and YouTube will tell you one of these is "the right one." It's a lie. All three work, they serve different goals, and they can be combined across the year:

Base (Sep–Dec): polarized, lots of Z2.

Build (Jan–Mar): pyramidal or threshold, more time in the middle.

Peak (Apr): race-specific.

Taper (May): whatever the race calls for.

How Vetta handles it

Vetta Trainer ships with 12 hardcoded philosophies: Daniels VDOT, Lydiard, Kilian mountain, Coggan power, Sweet-spot, Classic polarized, MTB XC, swim CSS, classic triathlon, and others. When you pick a primary sport in your profile, the engine suggests the philosophy that fits. If you want to be specific, you can [force the philosophy manually](https://vettatrainer.com/training) from Engine Settings.

The engine spreads weekly volume across days based on the philosophy's weights: pick Polarized and you'll see 80% of weekly volume in Z1-Z2 (long runs, recovery, aerobic) and 20% in Z4-Z5 (intervals, hill repeats), with almost nothing in Z3.

Try it free

[Connect your Strava](https://vettatrainer.com/signup) — first 7 days you're Pro automatically — and pick the philosophy that fits you. The engine builds your week so you don't have to design each session by hand.