Heart Rate Zones for Rowing, Explained
The short version
There are five heart rate zones. Zone 2 is where you should spend most of your time. Most rowers don't. They row too hard on easy days, too easy on hard days, and wonder why they plateau.
Here's how the zones break down, what they feel like on the erg, and how to actually use them.
The five zones
| Zone | Name | % of Max HR | What it feels like |
|---|---|---|---|
| Z1 | Recovery | Below 60% | Barely working. Cool-down pace. |
| Z2 | Aerobic | 60–75% | Conversational. You can talk in full sentences. |
| Z3 | Tempo | 75–85% | Uncomfortable. Short phrases only. |
| Z4 | Threshold | 85–92% | Hard. You're counting down the meters. |
| Z5 | Max | Above 92% | All-out. Sustainable for minutes, not sessions. |
Rowers have their own names for these same zones: UT2 (roughly Z2), UT1 (Z3), AT (Z4), and AN (Z5). Different labels, same physiology.
Why Zone 2 is harder on a rower
Cycling is the easiest sport for holding a steady Zone 2 heart rate. Running is harder. Rowing is the hardest.
The reason is muscle mass. Rowing uses roughly 86% of the muscles in your body. More muscles working means your heart has to pump more blood, which drives your heart rate up even at low perceived effort.
A pace that feels easy can still push you into Zone 3 on the erg. This is why so many rowers accidentally train too hard on their "easy" days.
The fix: slow down more than you think you need to. If you can't hold a conversation, you're not in Zone 2.
Zone 3 purgatory
This is the most common training mistake in rowing.
Zone 3 is too hard to recover from quickly, but too easy to trigger high-intensity adaptations. Rowers call it the "grey zone." It feels productive because you're sweating and breathing hard. But it's the least effective zone for improvement.
Most rowers default to Zone 3 for every session because:
- Zone 2 feels embarrassingly slow
- Zone 4+ is genuinely painful
- Zone 3 feels like "a good workout"
The result is flat performance. You put in the hours but your 2K time doesn't move.
The 80/20 rule
Research from exercise physiologist Dr. Stephen Seiler found that elite endurance athletes across all sports follow a similar pattern: 80% of training at low intensity (Z1–Z2), 20% at high intensity (Z4–Z5).
Almost no time in Zone 3.
This is called polarized training. The easy sessions stay truly easy, so you recover fast. The hard sessions go truly hard, so you get the maximum stimulus. The gap in the middle is intentional.
One caveat for recreational rowers. The 80/20 split works best at high training volumes — 8 to 10 sessions per week. If you're rowing 3 times a week, some Zone 3 (tempo) work is appropriate. At low volumes, skipping it entirely can leave performance gains on the table.
How RowCraft uses zones
Every workout in RowCraft has a target training zone. The app derives your personal pace targets from your FTP (Functional Threshold Power):
- Below 60% FTP → Zone 1 (Recovery)
- 60–75% FTP → Zone 2 (Aerobic)
- 75–85% FTP → Zone 3 (Tempo)
- 85–92% FTP → Zone 4 (Threshold)
- 92%+ FTP → Zone 5 (Max)
A Zone 2 workout at 70% FTP shows a different target pace for a 150-watt rower versus a 250-watt rower. The zones scale to you.
Each zone has a color in the app — green for recovery, blue for aerobic, amber for tempo, orange for threshold, red for max. You can see the intensity profile of any workout before you start it.
What to do with this
- Test your FTP. Without it, zone targets are guesses.
- Check your heart rate during steady state rows. If you're above 75% of max HR, you're not in Zone 2.
- Make easy days easy. It should feel like you could row for hours. That's the point.
- Make hard days hard. When the workout calls for Zone 4, commit to it. Half-effort intervals don't produce adaptations.
- Accept that Zone 2 is slow. Your ego will resist. Your fitness will thank you.
A structured training plan enforces the 80/20 split automatically — it removes the decision so you don't drift to Zone 3 purgatory every session.