Rowing UT2: What It Is and Why It Builds Your Engine

UT2 is rowing's easy aerobic base band. What it means, the heart rate and stroke rate to hold, how it fits the UT2–AN system, and how to row it well.

Sven Ahrens2026年6月23日最終更新 2026年9月6日

rowingUT2aerobic baseheart rate zonesconcept2

UT2, short for Utilisation 2, is the easiest of rowing's five training bands and where most of your training belongs. It is steady aerobic work at roughly 55–70% of maximum heart rate, at a low stroke rate of 18–20 strokes per minute, easy enough to hold a conversation. It is rowing's version of Zone 2.

What does UT2 mean?

UT2 comes from the five-band system used by British Rowing and World Rowing, originally a German/FISA framework. Easiest to hardest:

UT2 (Utilisation 2): easy aerobic base · ~55–70% HRmax
UT1 (Utilisation 1): firmer steady state · ~70–80% HRmax
AT (Anaerobic Threshold): threshold work · ~80–85% HRmax
TR (Oxygen Transport): VO₂max intervals · ~85–95% HRmax
AN (Anaerobic): maximal, short · ~95%+ HRmax

"Utilisation" means using oxygen and fat efficiently. UT2 and UT1 are both aerobic base bands. UT2 is the easier one. Get your own bands in beats per minute from the rowing heart-rate zones calculator.

最大心拍数

190bpm

ゾーン	範囲	鍛えられるもの
UT2	ユーティライゼーション2（UT2） 105–133 bpm	長い有酸素的土台、ローイングボリュームの基盤。 RPE 2〜3、定常状態、楽に会話できる。
UT1	ユーティライゼーション1（UT1） 133–152 bpm	上位の有酸素的持久力と効率。 RPE 4〜5、快適に頑張っている。
AT	無酸素性閾値（AT） 152–162 bpm	乳酸性作業閾値。持続可能なレース距離ペース。 RPE 6〜7、きついがコントロールされている。
TR	トランスポート（TR） 162–181 bpm	VO₂maxと酸素運搬。2k特化。 RPE 8〜9、非常にきつい。
AN	無酸素（AN） ≥ 181 bpm	無酸素性パワー。スタートとスプリント。 RPE 9〜10、最大。

UT2

ユーティライゼーション2（UT2）

105–133 bpm

UT1

ユーティライゼーション1（UT1）

133–152 bpm

無酸素性閾値（AT）

152–162 bpm

トランスポート（TR）

162–181 bpm

無酸素（AN）

≥ 181 bpm

UT2 · ユーティライゼーション2（UT2）. 長い有酸素的土台、ローイングボリュームの基盤。 RPE 2〜3、定常状態、楽に会話できる。

UT1 · ユーティライゼーション1（UT1）. 上位の有酸素的持久力と効率。 RPE 4〜5、快適に頑張っている。

AT · 無酸素性閾値（AT）. 乳酸性作業閾値。持続可能なレース距離ペース。 RPE 6〜7、きついがコントロールされている。

TR · トランスポート（TR）. VO₂maxと酸素運搬。2k特化。 RPE 8〜9、非常にきつい。

AN · 無酸素（AN）. 無酸素性パワー。スタートとスプリント。 RPE 9〜10、最大。

British RowingとConcept2は5バンドモデル（UT2 → AN）を使います。トレーニングの大半は定常的なUT2の運動で、2kが依存する有酸素エンジンを築きます。
可能なら、これらを2kスプリットにも基づかせてください。UT2はおよそ2kペースより500 mあたり20〜30秒遅く、ATは約8〜12秒遅く、TRは2kペース付近です。

パーソナライズされた結果のPDFと、いつでも再表示できるQRコード付き。

Why is UT2 so important?

The adaptations that make you a faster rower are built at easy intensity over many hours. UT2 develops aerobic endurance:

Mitochondrial density: more cellular engines in the muscle.
Capillarisation: more blood vessels delivering oxygen and clearing waste.
Fat metabolism: sparing carbohydrate by burning fat.
Stroke efficiency: long, low-rate work grooves a relaxed, repeatable stroke.

This is the same principle as polarized training and Zone 2 in running and cycling. A bigger aerobic base means you row faster before lactate piles up, recover quicker, and absorb more training.

How do I row in UT2?

Use several signals, because heart rate alone can mislead:

Heart rate: inside your UT2 band, 55–70% of max. If you do not know your max, see finding your maximum heart rate.
Stroke rate: 18–20 spm. Low rate forces length and leg drive.
The talk test: full sentences. Snatching breaths means you have drifted into UT1.
Your split: note the 500 m split that matches UT2 today, but treat it as a result of the effort, never a target.

A typical session is 40 to 90 minutes of continuous steady rowing. Longer and easy beats shorter and "productive."

The most common UT2 mistake

Rowing it too hard. The erg shows you a split and nudging it down feels like progress. Creeping into UT1 turns an easy day into a moderately hard one: enough to cost recovery, too little to drive adaptation. Keep the rate down, keep breathing conversational, and save hard efforts for AT, TR and AN sessions.

Expect cardiac drift on long pieces. Trust breathing and stroke rate over a few late high beats.

How much UT2 should I do?

In a well-structured rowing week, around 70–80% of volume sits in the aerobic bands (UT2 and UT1), with a smaller dose at threshold and above. For most recreational rowers that means mostly steady-state sessions plus one or two hard workouts. Beginners can go even easier while the base builds.

Olympic-level crews go higher still: published studies put the easy fraction at 77% to 94% of training volume. See how elite rowers train.

UT2 on the erg vs. on the water

Same physiology, different feedback. On the erg the monitor gives a precise split and rate, so holding UT2 is easy if you resist chasing the number. On the water, wind, stream and crew move the split constantly, so heart rate, stroke rate and feel lead. Either way: low rate, easy breathing, steady effort.

FAQ

Is UT2 the same as Zone 2? Yes. UT2 is rowing's name for the easy aerobic base zone other sports call Zone 2. The heart-rate ranges line up at ~55–70% of max.

What heart rate should UT2 be? Roughly 55–70% of your maximum heart rate. Get your exact band from the rowing zones calculator.

What's the difference between UT2 and UT1? Both are aerobic base bands. UT2 is easier and lower rate, and takes more of your volume. UT1 is a firmer steady state just above it at ~70–80% HRmax.

What stroke rate is UT2? 18–20 strokes per minute. The low rate builds length, leg drive and efficiency.

Sources

World Rowing / British Rowing (FISA) UT2–AN training-band model, as used in Concept2 training guidance
Seiler, training-intensity distribution
San Millán, Zone 2 physiology