Adaptive Indoor Rowing: Start With the Person

The rower in front of you has been on an erg for three weeks, for nine years, or not at all. They have a shoulder that will not take a wide grip, a job that ends at six, a gym whose machines are all booked, or a spare room with a neighbour's wall two metres away. Hand all four the same four-part session and you have not adapted anything. You have only found out who could not do it. The session is the last thing you decide, not the first.

The context

Adaptive indoor rowing is usually sold as a taxonomy: classifications, seat types, straps, foot plates, seat heights, a list of who rows what. Those adaptations are real, and the manufacturer publishes them because the machine genuinely can be changed ([12] Concept2 2024). But a taxonomy tells you what to change on the erg, not where to start with the person who is going to use it.

The framework that does is older and simpler. Hutzler proposes a model for adapting physical activity, set in an ecological frame of reference, that addresses five things in order: the task objective, the criteria the task is judged by, the person's limitation and enablement criteria, the performance errors that appear when the two do not match, and the adaptation suggestions that follow ([1] Hutzler 2007). Read it as a coaching instruction rather than a taxonomy. The objective belongs to the rower, the task is yours to write, and the errors are the data.

That model also separates a constraint from a limitation. A limitation is something about the body that the session has to work within: a trunk that cannot extend, a shoulder that will not take a wide grip, a capacity for shedding heat that does not scale with effort. A constraint is something outside the body that the session has to work around: two free evenings instead of six, one machine in a busy gym, no ergometer at all. You can change a constraint this week. Changing a limitation is adaptation, and it is slower and not guaranteed.

Doing this well is not a matter of opening the door and hoping. Interviews with 49 stakeholders about a child-centred clinic that helps children with a physical disability join ordinary local sport clubs concluded that effective support needs three things at once: an individualised approach, structured guidance for children and parents, and strong networks linking hospitals to the clubs ([2] Muselaers 2026). The person is the subject. The approach, the guidance and the connections around them are the objects.

The core idea

Here is the part that gets lost inside the taxonomy. Most of the adaptation happens in the session, not in the body.

Cut volume first. The commonest error in a scaled-down session is keeping the duration and dropping the rest, so the rower works hard in a short session. The evidence on exercise dose for adults with spinal cord injury gives a floor rather than a ceiling: for cardiorespiratory fitness and muscle strength, at least 20 minutes of moderate-to-vigorous aerobic work twice a week, plus three sets of resistance exercises for each major functioning muscle group at moderate-to-vigorous intensity, twice a week. For cardiometabolic health, at least 30 minutes of moderate-to-vigorous aerobic work three times a week ([3] Martin Ginis 2018). Twenty minutes twice a week is not a consolation prize. It is the dose.

Then intensity, and only when the stroke holds. Stroke rate is the most tempting thing to add and the most expensive to add badly. In maximal one-minute bouts at 20, 28 and 34 strokes per minute, 24 high-level rowers produced more handle power in the first half of the drive at the higher rates, and that came with a technical change: a greater mean-to-peak power ratio at each segment, and a delayed trunk extension with no significant rise in erector spinae activation ([8] Duchene 2025). The same study calls low-rate rowing a deliberate strategy for earlier trunk extension. Rate changes technique, which is a reason to earn the rate rather than avoid it forever.

Then complexity. Add the next piece of the drill only after the first two are stable: a session that is too long, too fast and too complicated at once tells you nothing about which one caused the breakdown.

And never the stroke. In maximal 500 m pieces with the trunk swing either restricted or unrestricted, PR2 rowers and non-eligible rowers were faster and produced greater stroke impulse with the swing unrestricted, while PR1 rowers - who have impaired trunk swing by definition - were faster with the swing restricted and gave up almost nothing in force production ([5] Lafreniere 2025). The swing is not decoration. Restrict it and you have taken away something the rower was using.

The fixed-seat stroke is not a worse version of the sliding-seat stroke, and knowing what it looks like lets you coach it rather than correct it. A structured synthesis of fixed-seat kinematics found more forward and backward thoracic movement than in sliding-seat rowing, 75 to 77 degrees against 44 to 52 degrees, with knee flexion of 30 to 35 degrees - less than a standard seat, but not nothing ([6] Agius 2023). The same paper explains why fixed-seat rowers do not carry an increased risk of back injury. So do not coach a fixed-seat rower's rounded back into a sliding-seat shape. That is the seat talking, not a fault.

Two more things belong in the history rather than in the programme. The limiter is often breathing, not the legs: in arm ergometry, people with cervical spinal cord injury showed smaller tidal volume, compensated by a higher breathing frequency, and developed dynamic hyperinflation at 80 per cent of peak work rate that able-bodied participants did not ([10] Gee 2021). If the breathing changes before the power does, the session is telling you something. And heat tolerance is personal: in 60 minutes of arm ergometry at 60 per cent of peak oxygen uptake in cool conditions, able-bodied and paraplegic athletes both rose about 0.6 °C in aural temperature, while the tetraplegic athlete rose 0.9 °C and stayed elevated through recovery ([4] Price 1999).

The how-to

1. Take a history that changes the session. Five questions, written down: how long they have trained and how consistently; what they rowed in the last four weeks; what hurts and what a clinician has said about it; what equipment they have and where it is; and which hours in the week are genuinely free rather than nominally free. Then ask what the rowing is for - a race, a shoulder that stays quiet, a number they are not embarrassed by. The objective is theirs, and you cannot ask it at minute eighteen.

2. Separate the constraints from the limitations, then go after the constraints. Two free evenings means two good sessions, not five bad ones and a missed one. A busy gym means booking the machine or choosing a quieter hour. No ergometer at all does not mean no aerobic work: twenty minutes of it, twice a week, is the dose that moves fitness ([3] Martin Ginis 2018). A body limitation gets a slower conversation, and belongs with a clinician.

3. Scale down in a fixed order: volume, then intensity, then complexity. Cut the duration first and keep the strokes long and the finish clean. Only then change the rate. Only then add the next piece of the drill.

4. Do not touch the stroke, or the order of the drill. Whatever you scale, the rower keeps the stroke they have - leg drive, body swing, arm finish, in that order - and the drill keeps its sequence. Restricting the trunk swing costs PR2 and non-eligible fixed-seat rowers both time and stroke impulse ([5] Lafreniere 2025). Reordering a drill changes what the drill teaches.

5. Give the equipment to the constraint. The manufacturer publishes the rig changes that matter: fixed seats, straps, foot plates, seat height and position ([12] Concept2 2024). Pick the set-up that lets the rower finish the piece with the stroke intact, and know the first published benchmark values for the para set-ups. Able-bodied rowers in the legs-trunk-arms set-up produced handle force comparable to the able-bodied literature, but with more lumbar flexion at the catch and a larger range of motion through the stroke, and the trunk-and-arms and arms-and-shoulders set-ups pushed those ranges further ([7] Cutler 2017). More range of motion is not automatically better. It is a thing to watch.

6. Read the logbook in a fixed order. Start with the subjective columns: sleep, mood, soreness, how the session felt. Across 56 studies that reported both subjective and objective measures of athlete well-being, the two generally did not correlate with each other, and the subjective measures tracked acute and chronic training load with more sensitivity and more consistency than the objective ones; subjective well-being typically dipped when training load rose and recovered when it fell ([11] Saw 2016). Then read the session itself: did the stroke hold, did the rate hold, did the last piece look like the first. Then the numbers, and treat them as the third opinion rather than the verdict.

That is how you tell a bad week from a bad plan. A bad week shows up in the subjective columns while the stroke, the rate and the splits stay where they were: the load landed hard, so reduce it and leave the programme alone. A bad plan shows up in the session itself - the stroke falls apart as the piece goes on, the rate cannot be held, every session costs more than it should - and gets rebuilt.

The trade-offs

Three honest limits. The first is that most of this literature is about people with spinal cord injury, and much of it was not collected on a rowing ergometer. The dose guideline is an international consensus built from a systematic review and three consensus panels ([3] Martin Ginis 2018). The training-load review is a general sports-monitoring review ([11] Saw 2016). The kinematics come from small biomechanics studies: 24 high-level rowers in the stroke-rate work ([8] Duchene 2025), and a small group of experienced able-bodied fixed-seat rowers on a laboratory rig ([6] Agius 2023). Read all of it as the best available evidence, not as a prescription.

The second is that the adaptation model is a framework, not an algorithm. Hutzler's model was illustrated with four individual case examples, across physical education, rehabilitation, competition and recreation ([1] Hutzler 2007). It tells you what to look at and in what order. It does not tell you what to do about a shoulder that clicks, and it does not replace a clinician.

The third is that most of the numbers come from small, selected samples, so the history you take matters more than any single figure. The thermoregulation data come from one 60-minute laboratory trial, and the tetraplegic figure rests on a single athlete while the able-bodied and paraplegic conditions were groups ([4] Price 1999). The ratings-of-perceived-exertion meta-analysis pooled nine studies and 95 adults, and the authors graded the certainty of that evidence as low ([9] Valentino 2022). Perceived effort is a workable dial for people with spinal cord injury: every one of those studies prescribed intensity with a rating of perceived exertion scale, seven of eight reported an improvement in peak oxygen uptake and five of seven an improvement in peak power, with mean gains of 2.92 mL/kg/min and 9.8 watts.

What to do tomorrow

1. Write down five answers before the next session: how long they have trained, what they did in the last four weeks, what hurts, what equipment they have, and which hours are actually free. Add one line more: what they want this to be for.
2. Name the two constraints you could remove this week, and remove one of them. Busy gym, no ergometer, two evenings - take the easiest to fix and fix it before you touch the programme.
3. Put the scaling order on the wall: volume, then intensity, then complexity. Underneath it, put the two things that do not change - the stroke, and the order of the drill.
4. Add a subjective column to the logbook: sleep, mood, how the session felt. Leave the heart rate where it is, as one opinion among several.
5. Agree the "add something" rule with the rower in advance: the stroke held through the last piece, the rate held, and the effort the same as last week's session of the same length. All three true means you add one thing next week. The stroke changed means you add nothing.