Rowing Pace Zones Explained: The 6-Zone System for Erg Training

Every effective training plan is built on pace zones. Zones tell you how hard to pull in each session — and more importantly, how easy to keep the easy days. Here's the six-zone system used in structured rowing training.

The six rowing pace zones

Pace zones are expressed as offsets from your benchmark split (usually your 2k pace). Each zone targets a different physiological adaptation.

| Zone | Name | Offset from 2k | Heart rate | Purpose | |------|------|----------------|------------|---------| | UT2 | Utilisation Training 2 | +20–26 sec/500m | 55–70% max | Aerobic base, fat oxidation | | UT1 | Utilisation Training 1 | +14–18 sec/500m | 70–80% max | Aerobic development | | AT | Aerobic Threshold | +8–12 sec/500m | 80–85% max | Lactate threshold | | TR | Transportation | +4–7 sec/500m | 85–90% max | VO₂max development | | AN | Anaerobic | +1–3 sec/500m | 90–95% max | Anaerobic capacity | | Max | Maximum | 0 to -1 sec/500m | 95–100% max | Maximum power |

Example: If your 2k split is 1:50/500m, your UT2 zone is roughly 2:10–2:16/500m, and your AT zone is around 1:58–2:02/500m.

What each zone does

UT2 — The base builder

This is where most of your training should happen. UT2 develops mitochondrial density, capillary networks, and cardiac stroke volume. It should feel genuinely easy — conversational pace.

Most athletes underestimate how slow UT2 should be. If you can't comfortably talk in full sentences, you're working too hard.

UT1 — Moderate aerobic

Slightly harder than UT2, this zone develops aerobic capacity with a moderate lactate response. It's useful for longer tempo rows and steady-state work during the build phase.

AT — Threshold work

Training at your aerobic threshold teaches your body to clear lactate at higher power outputs. This is the zone for classic threshold intervals: 3–4 × 10–15 minutes with structured rest.

This zone is where most competitive performance gains come from — but only if the aerobic base supports it.

TR — Transport zone

High-intensity intervals in this zone develop VO₂max. Typical sessions: 5–8 × 3–5 minutes. Heart rate should approach maximum by the end of each rep.

AN — Anaerobic

Short, near-maximum efforts that develop anaerobic capacity and power. Used sparingly in the specific and race-prep phases. Think 8 × 500m with full recovery.

Max — Peak power

Race pace or faster. Reserved for race rehearsals, time trials, and the final weeks of a training cycle. Rows here are short and infrequent.

Intensity distribution: the 80/20 rule

Research on elite endurance athletes shows a consistent pattern: roughly 80% of training at low intensity (UT2/UT1) and 20% at high intensity (AT and above).

This "polarised" model outperforms threshold-heavy approaches where most training happens at moderate intensity (Seiler & Kjerland, 2006). The easy days build the foundation; the hard days provide the stimulus.

The exact distribution shifts across training phases:

• Foundation phase: 85% low / 5% moderate / 10% high
• Build phase: 75% low / 12% moderate / 13% high
• Specific phase: 65% low / 12% moderate / 23% high
• Taper: 50% low / 15% moderate / 35% high

Calculating your zones

You need one thing: a recent benchmark test. A 2k time trial is the standard, though a 6k test or 60-minute test works too.

From your 2k split:

1. UT2 = 2k split + 20–26 seconds
2. UT1 = 2k split + 14–18 seconds
3. AT = 2k split + 8–12 seconds
4. TR = 2k split + 4–7 seconds
5. AN = 2k split + 1–3 seconds
6. Max = 2k split or faster

ErgBuddy calculates these automatically from your benchmark and adjusts them based on your training phase and goal distance.

Common zone mistakes

Training in the "grey zone." Spending most of your time at moderate intensity (between UT1 and AT) is the most common error. These sessions are too hard to recover from easily but too easy to trigger significant adaptation.

Not testing regularly. Zones drift as fitness changes. Re-test every 4–8 weeks to keep your zones accurate.

Ignoring stroke rate. Zone training works best at controlled stroke rates. UT2 at 18–20 spm, AT at 22–26 spm, anaerobic at 28–34 spm.

Why zones matter

Without zones, most rowers default to the same medium effort every session. Zones break that pattern by giving every workout a clear purpose. Easy days get easier. Hard days get harder. And performance improves faster.

Try ErgBuddy free to see your personalised pace zones calculated from your benchmark results.