Force Curve

By the Watta Team · Updated

Force Curve: The force curve is a graph on the Concept2 PM5 that shows how much force you apply to the handle during each stroke, used to diagnose rowing technique.

What is Force Curve?

The force curve is a real-time graphical display on the Concept2 PM5 showing how force is applied during the drive phase of each stroke. The x-axis represents the drive from catch to finish, and the y-axis represents the force applied. An ideal force curve has a smooth, bell-shaped profile — rapid force application at the catch, peak force in the middle third of the drive, and a gradual taper to the finish. Common technique issues visible on the force curve include: a slow start (weak catch), a double peak (opening back too early), or a sharp drop (collapsing at the finish). Coaches use the force curve as a diagnostic tool because it reveals stroke mechanics that are difficult to observe visually. By learning to read your force curve, you can connect technique changes directly to power output and efficiency.

How Watta Uses Force Curve

While Watta does not currently capture the force curve graphic, the stroke rate and watts-per-stroke metrics it does capture provide insight into rowing economy. The Economy component of the Effort Score (10% weight) rewards efficient power production, which correlates with good force curve mechanics.

Further Reading

Frequently Asked Questions

What is a force curve in rowing?
A force curve is a graph on the Concept2 PM5 monitor that shows how much force you apply to the handle throughout each stroke. It helps diagnose technique and stroke efficiency.
What does a good force curve look like?
A good force curve is smooth and roughly bell-shaped: quick rise off the catch, peak force in the middle third of the drive, and a gradual taper. Avoid sharp spikes, dips, or double peaks.
How do I see my force curve on Concept2?
On the PM5, press the "Change Display" button during rowing until you see the force curve view. It updates stroke-by-stroke. The average force curve is also shown in the Concept2 ErgData app.
What does a double peak force curve mean?
A double peak usually means you are opening your back too early in the drive, creating two separate surges of force instead of one smooth acceleration. Fix it by keeping your back stable until your legs are nearly straight.
Can the force curve help me row faster?
Yes. Optimising your force curve improves mechanical efficiency — you produce more watts for the same perceived effort. Focus on a strong catch connection and smooth drive through the finish.

Related Content

Stroke RateStroke rate, or strokes per minute (SPM), is the number of complete rowing strokes you take in one minute on the ergometer.Watts (Rowing)Watts in rowing measure the power output on an ergometer, calculated from the pace using the Concept2 formula: Watts = 2.80 / pace³.PM5 MonitorThe PM5 (Performance Monitor 5) is the current-generation display unit on Concept2 ergometers, showing split time, distance, stroke rate, watts, heart rate, and other workout metrics.ErgData AppErgData is Concept2's official mobile app that connects to the PM5 via Bluetooth to display real-time workout data and sync results to the Concept2 Logbook.Erg Monitor MetricsErg monitor metrics are the real-time performance data displayed on the Concept2 PM5 screen during rowing, including split time, stroke rate, watts, distance, calories, and force curve.The DriveThe drive is the power phase of the rowing stroke where the rower pushes with the legs, swings the back, and pulls with the arms to accelerate the flywheel.Effort Score CalculatorErg Technique GuideFor Competitive RowersFor Rowing Coaches
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