Concept2 and Your AI Coach: Turn Erg Data Into Training

Your Concept2 logbook is full of the cleanest power data in training. Every erg session imports distance, time, split, watts, and stroke rate. Most rowers never look at the file twice after the result posts. That's because the logbook is a lockbox. Your erg numbers sit there isolated from your running, cycling, and strength work. The coach sees isolated training.

The honest difference an integrated erg system makes: your coach can read a 2K test at 1:50 as a 2K test, and see that you rowed hard yesterday, so today's suggested run is easy. It can trade a Friday hard row for a Saturday run if you need to offload shoulder stress before a meet. It programs your entire training week because it knows how hard you rowed, not because it's guessing from general rowing wisdom.

What the Concept2 OAuth integration actually does

Movement Rebels connects to your Concept2 Logbook account via a one-time OAuth connection in the app's Integrations section. You grant read access to your results. From there, every row, ski, and bike session syncs automatically. A manual "sync now" button backfills your history if you have older entries.

Each piece imports with full detail:

• Distance and time. Core facts.
• Pace per 500 metres (your split). The headline number. If you rowed a 2K at 1:55/500m, that metric lands in your training data.
• Average watts. Concept2 derives this from its pace-power law: watts = 2.80 / (seconds-per-metre)³. A 1:50 split is 110 seconds per 500m, or 0.22 seconds per metre, which works out to about 263 watts. The app stores the watts so you can track power trends across a season without recalculating.
• Stroke rate (strokes per minute). The cadence of your rowing, 18 to 36 SPM typically.
• Heart rate. If your erg or Garmin watched your heart rate during the row and sent it to Concept2, it syncs too.
• Calories. The energy cost the machine reports.
• Workout type. Steady state, intervals, mixed, custom label.

These sessions land in your normal training history alongside your runs, rides, and lifts. The session card shows your /500m split front and centre. You see your erg work in the same list as your other workouts, not in a separate erg-only silo.

Why erg data is so clean and what that means

A Garmin run is affected by GPS drift, terrain, wind, pacing consistency across hills. A cycle power meter is affected by sensor calibration and installation. An erg is bolted to the ground and measures stroke rate, resistance, and time per stroke with mechanical simplicity. The split you see is the split you rowed.

That precision matters when the coach reads your data. A 2K test at 1:52/500m is a genuine 2K test. Your Wednesday steady-state row at 2:05/500m is genuinely steady state, not a guess from heart rate and perceived effort. The coach can trust the power metric.

Stroke rate accuracy also matters. A 2K test you rowed at 32 SPM is a different effort than the same split at 26 SPM. One is a sprint with high drive, one is a grinding push. The coach sees both and can reason about your strategy, not just your speed. Strokes per minute also reveals whether you're fighting the machine (spiralling cadence) or holding form (steady SPM across a hard set).

Reading your splits and what the numbers mean

Your split is pace: time per 500 metres. A 1:50 split is 1 minute, 50 seconds per 500m, the pace you hold across a 2K or a steady-state block.

Watts is power, derived from your split. Most rowers find it easier to think in splits (your 2K baseline, your steady-state pace), but watts give you one number to track across a season. Two rowers at the same split produce the same watts, light or heavy, because the number comes from pace alone. Where bodyweight matters is comparison: a lighter rower holding 263 watts works at a higher output relative to their size, which is what a weight-adjusted erg score captures. For your own progress, watch split and heart rate together. The same split at a lower heart rate week to week means your engine is getting stronger.

Stroke rate is efficiency. Most rowers optimize somewhere between 26 and 30 SPM for steady-state, higher for 2Ks. If your split is constant but your SPM drifts up from 28 to 31, your driving power is dropping. You're rowing faster leg-beat to hold the same pace. If your SPM falls from 28 to 26 while pace holds, your drive is stronger and you're gliding longer. Neither is good or bad in context, but the change tells you something about fatigue state.

An erg calculator turns any split into watts, pace, and calories, so you can sanity-check a session's numbers without doing the math by hand.

A 2K predictor takes your test result and projects your paces at other distances (500m, 6K, a 30-minute piece). It is rowing-specific, because pace scales differently with duration on the erg than it does for running.

Using the erg as training and the zones that matter

Your erg life divides into three intensity zones.

Zone 1: Steady state. Long, controlled rows at 2:05 to 2:15 per 500m, usually 10 to 20 seconds per 500m slower than your 2K pace. Heart rate rises and stabilizes into your aerobic zone. You can hold a conversation in fragments. Duration ranges from 20 minutes to an hour. This is your big-volume work, the base of your fitness. If you don't know your heart rate training zones from your max or resting heart rate, a calculator gives you the bpm bands to hit.

Most of your erg time should live here. A program that loads you up with Steady state teaches your body to burn aerobic fuel efficiently. The coach will use your recent steady-state data to calibrate the zone: if your last steady row was 2:07 at 142 bpm, the coach knows that's your Zone 1 pace and will recommend that band for base-building weeks.

Zone 2: Threshold. Rows at your 6-minute race pace, usually around your 2K split, 1:50 to 2:00 per 500m. Heart rate climbs into the high 160s to mid-170s. You can speak a sentence if pushed. Duration 3 to 12 minutes, usually repeated with recovery between sets.

Threshold work trains the power you can sustain across a 6-10 minute effort. A well-done threshold session has three to five hard blocks (4 minutes each), recovery rows in between (2 minutes at Zone 1), and a warm-up and cool-down. The coach will land threshold work after you have built a base, and will not stack threshold with threshold on back-to-back days.

Zone 3: VO2-max and sprint. Short, hard efforts at your 2K split or faster, 1:40 to 1:50 per 500m or harder. Heart rate climbs to maximum. You cannot talk. Duration under 5 minutes, usually 500m to 2 min repeats, high recovery between.

VO2-max work is smaller volume but high intensity. A single VO2-max session per week is enough in most plans. Two in a week risks staling you. The coach reads your recent erg tests and knows your max power, so it will not prescribe VO2 work that requires a higher split than you have proven.

The 2K test as your annual or seasonal standard

A Concept2 2K test is a maximal effort: row 2,000 metres as fast as you can, empty the tank, stop. It takes 6-10 minutes depending on your level.

This is your headline number. If your 2K is 1:52/500m, that's your baseline. Every 2-4 months you test again to see if the training improved you or if you have drifted. A drop of 3-5 seconds per 500m across a training block is genuine progress. A rise of 3 seconds suggests fatigue, injury, or a deload stealing your fitness.

Use the 2K predictor to set your threshold and sprint zones from your test result, so you know what splits to hold in each session instead of guessing.

Test in a known state: 48 hours of light training, fed normally, slept well. Avoid testing after a heavy strength day. A 2K after a hard squat or deadlift session is just exhaustion with a lower number, not a real test.

Cross-domain load: how the coach reads your erg work

Your rowing is one piece of your total training. The coach sees it alongside your runs, your rides, your strength sessions, and your recovery.

A hard 2K row is a nervous-system effort. It is not the same stress as a 3-mile tempo run, but it is stress. If you test on a Tuesday, your Wednesday easy run should stay easy. If you have a Friday long run planned and you hit a hard threshold block on Thursday, the coach might adjust one of them. Two hard days in a row is possible, but not around critical sessions.

The coach also reads your stroke rate and power curves across your erg history. If every steady-state row for the past month is trending up in split but staying the same SPM, your power is dropping. The coach notices and pulls back hard sessions to let you recover. If you rowed a 1:52 2K last month and your steady rows have been sluggish ever since, the coach knows you are still recovering, not ready for threshold work.

This is the leverage point of integrated training: one app watching all your stress and recovery across every domain. Garmin sees your runs, Movement Rebels sees your erg, you log your strength and your meals, and the coach assembles a coherent week instead of three separate programs that accidentally conflict.

Erg training for hybrid and HYROX athletes

A hybrid athlete (strength plus endurance) has a real challenge: both domains demand recovery. A heavy leg day plus a hard 2K row on the same Friday is a stressor stack. The coach sees both and pulls one back to lower the combined load.

HYROX athletes especially. Your race is eight 1 km runs, each followed by a station: SkiErg, sled push, sled pull, burpee broad jumps, rowing, farmers carry, sandbag lunges, and wall balls. Train all of it. The coach can program your week so Monday is a heavy strength day (sandbag, wall ball, sled push), Wednesday is erg work (RowErg and SkiErg repeats), Thursday is a tempo run (the movement under fatigue), and the week stays coherent. Your long Saturday is HYROX-specific practice (run with two workstation rounds) instead of a volume session. The erg work trains your engine; the rotation stations and strength train your economy.

Common erg mistakes

Avoid these, and your erg training compounds.

Chasing stroke rate. A fast cadence (35 SPM) on a 2K feels faster but is usually less efficient. Optimal 2K cadence is 28-32 SPM, where your drive is powerful and your recovery is complete. If you are pulling 36 SPM, you're spinning, not rowing, and your split is suffering. Hold a cadence, let the pace come.

Ignoring drag factor. Drag factor is how much air the fan moves per stroke, set by the damper lever and shown as a number on the monitor. It is not resistance in the gym sense, it changes the feel of the stroke. Most rowers settle between 110 and 130. If the stroke feels like you are fighting the machine or slipping through with no load, check the damper and your drag-factor reading. A shift of five points changes the feel of the stroke.

All-out every session. Steady-state work is not optional. Most of your erg time should be controlled, sustainable pace. One hard 2K per week, one threshold session per week, and the rest base-building. Rowers who row hard every day get burned out or injured, then take months off. A structure of 70% easy, 20% threshold, 10% VO2 scales your erg training across a season.

Not testing regularly. You cannot know if you are improving without a benchmark. A 2K test every 8-12 weeks, done in a rested state, is the measure. Without it you are guessing your power and zones.

Ignoring heart rate trends. If your steady rows are climbing in heart rate at the same split, your cardiovascular fitness is dropping. If your heart rate falls at the same split week-to-week, you are getting stronger. The coach reads this trend and adjusts the load. Watch it yourself too: a rising resting heart rate across three days is a fatigue signal, a reason to dial back or take a day off.

How Movement Rebels fits

The honest limit of the Concept2 logbook: it is a vault. Great for the number, terrible for everything else. Rowing does not exist in a vacuum. A rower who trains strength, runs for endurance, eats for recovery, and sleeps eight hours is a different athlete than one who rows twice a day and ignores the rest.

The Movement Rebels coach connects your erg data to your full training life. It reads your 2K test and sets your zones. It sees your Wednesday threshold row and shapes your Thursday run around the leftover fatigue. It watches your steady-state pace trend across weeks and pulls back when it is drifting up. It reads your Garmin runs and knows a tempo run landed on Tuesday, so Friday's planned threshold row gets pushed to Saturday. It tracks your Rebel Fuel log and adjusts a recovery day when protein is low. It builds a coherent week instead of four separate training siloes.

Start with a test: a fresh 2K, rested and ready. Connect your Concept2 logbook. Build a base phase of mostly steady state, one test retest in eight weeks. Watch the erg data layer into your total training picture and adapt. The coach reads all of it.