IN ONE MINUTE
Use a personal range, then judge it in the context of the whole row.
Starting convention: British Rowing publishes UT2 at 59–67% of heart-rate reserve, with typical low perceived effort and low stroke rate.
Personal inputs: HRR uses both resting HR and maximum HR, so your bpm range should not simply copy somebody else's.
Opening minutes: heart rate takes time to rise towards its working level, so do not sprint to force the number into range.
Later minutes: cardiovascular drift can push heart rate upwards even when external work stays constant.
CALCULATING A STARTING RANGE
UT2 heart rate is not simply a percentage of maximum HR.
Heart-rate reserve accounts for the distance between resting and maximum heart rate. Rowing Zones uses the published 59–67% HRR convention as its default starting band unless you provide a complete zone profile or stronger independently measured evidence.
target HR = resting HR + (maximum HR - resting HR) × zone %For UT2 in the Rowing Peak starting convention, use 59% and 67% to create the lower and upper boundaries.WHY HRR?
It uses both ends of your usable heart-rate range.
Two rowers with the same maximum heart rate can have different resting heart rates and therefore different heart-rate reserve. Research comparing prescription methods found percentage HRR tracked percentage oxygen-uptake reserve more closely than a simple percentage of maximum heart rate.
That still does not make a formula equivalent to individual physiological testing. If a coach or laboratory has established more appropriate zones for you using a robust protocol, those should take precedence over a generic starting equation.
THE FIRST FIVE MINUTES
A low early reading does not automatically mean the pace is too easy.
Heart rate rises after exercise begins rather than instantly appearing at its later working level. Research including trained rowers has described this response over time. The practical consequence is simple: start at the planned pace and let the cardiovascular response establish itself before making large adjustments.
Rowing hard in minute one solely to make the monitor display a target number can overshoot the intended steady-state load before heart rate has caught up.
Troubleshoot an unexpectedly low UT2 heart rateTHE LAST TWENTY MINUTES
The same pace can become a higher internal load later in the row.
During prolonged steady exercise, heart rate can progressively rise even when external workload remains constant. Cardiovascular drift is one reason the appropriate pace for a long UT2 session cannot always be inferred from the first few minutes or from a much shorter row.
Heat, hydration, fatigue and other conditions can affect that response. Treat the band as a guardrail alongside how the session feels rather than as an instruction to chase individual beats minute by minute.
UT2 VS ZONE 2
Do not assume identical labels mean identical bpm.
Zone systems use different numbers of zones, different physiological concepts and different calculation methods. A watch that labels something “Zone 2” may use percentage of maximum heart rate, while the British Rowing UT2 convention above uses heart-rate reserve.
Compare the method and training purpose, not just the zone number.
Read the full Zone 2 vs UT2 comparisonTurn the heart-rate range into a row you can execute.
Choose UT2 and your planned session. Zones uses your available rowing evidence to prepare a practical pace and heart-rate guide.
Prepare a UT2 row