By Paul Kendrick, Cardio & Endurance Editor · Updated 17 September 2026
Rowing intervals are about as much work as you can cram into 20 minutes without your knees or shins filing a complaint. Every stroke recruits your legs, hips, trunk and arms, your feet never leave the footplates, and the monitor tells you exactly how hard each effort was, so there's nowhere to hide. That honesty is also the catch: a rowing machine punishes sloppy technique faster than a bike does, and flailing at 38 strokes a minute feels brutal while achieving very little. This guide gives you five sessions with exact numbers, how to set the machine up, and a four-week plan to string them together.
If you're new to rowing, spend a week or two on our rowing machine technique guide first. Intervals only amplify whatever stroke you already have.
The main reason is that you're not bouncing. Running intervals load your joints with every footstrike, whereas a rower lets you push your heart rate right up while seated, which is why plenty of people with cranky knees use it as their hard-effort machine (we compare the two in more detail in rowing machine vs running).
The second reason is that rowing is a big-muscle exercise. More working muscle means more oxygen demand for a given effort, and it spreads the fatigue so your legs aren't doing everything alone. In a 2022 study, middle-aged men with and without type 2 diabetes did HIIT combining rowing and cycling three times a week for 8 weeks, built from 1-minute hard efforts with 1 minute of recovery. VO2max went up in every group, insulin sensitivity improved, and nobody got injured. It wasn't a randomised trial and it was small, but the protocol is close to Workout 2 below.
HIIT also counts towards your weekly activity target. The NHS physical activity guidelines say 75 minutes of vigorous activity gives similar benefits to 150 minutes of moderate activity, and they explicitly recognise short bursts of very vigorous effort broken up with rest.
Resistance on a rower isn't a difficulty dial in the way a treadmill incline is, and cranking it up is the most common way people ruin interval sessions. How it works depends on the type of machine, which our guide to what type of rowing machine is best covers properly. The short version:
Two numbers matter on the monitor. The 500m split is how long it would take you to row 500 metres at your current speed, so a lower number means you're going faster. Stroke rate (spm) is strokes per minute, which is your cadence.
Power comes from how hard each stroke is, not how many you take. A good interval sees your split drop while your stroke rate rises only a little. If your rate jumps from 26 to 34 and the split barely changes, you've started rushing up the slide and the extra strokes aren't adding anything.
Budget magnetic rowers often estimate split and distance rather than measuring them precisely. That's fine; compare yourself against your own previous sessions on the same machine and ignore what anyone else posts online.
Don't skip this. Hard intervals on a cold body feel awful, and the first round will be your worst.
Rest means easy paddling at 18 to 20 spm unless it says otherwise. Aim for every hard interval to sit within about 2 seconds of your first split; if the last few are much slower, go a touch easier next time.
Row hard for 30 seconds at 26 to 28 spm, then paddle easily for 30 seconds. Repeat 10 times. The work intervals should feel strong but controlled, around 7 out of 10 effort. This is the best first session because the pieces are short enough that your technique shouldn't collapse.
Row hard for 1 minute at 26 to 28 spm, then paddle for 1 minute. Repeat 8 times. Pick a split for round one that you're confident you can hold for all eight, and resist the urge to go out fast. By round six this gets properly uncomfortable.
Row 250m hard at 28 to 32 spm, then take 90 seconds of easy paddling. Do 6 repeats in your first attempt and build to 10 over a few weeks. Each rep takes most people somewhere between 45 and 70 seconds. Set the monitor to a distance interval if it has one; otherwise just watch the distance counter.
Row 1, 2, 3, 4, 3, 2 and 1 minute hard, with rest equal to half the work time (30 seconds after the 1-minute pieces, 1 minute after the 2s, and so on). Drop your stroke rate as the pieces get longer: 28 to 30 spm for the 1-minute efforts, 26 to 28 for the 2s and 3s, and 24 to 26 for the 4. The longer efforts are worth the suffering. A 2019 meta-analysis of 53 HIIT trials found that even short, low-volume HIIT improved VO2max, but intervals of 2 minutes or more, sessions with 15 minutes or more of work, and programmes lasting 4 to 12 weeks produced larger gains.
Row all-out for 20 seconds at 30 to 34 spm, then rest completely (hands on the handle, legs straight) for 10 seconds. Repeat 8 times. Row 3 to 4 easy minutes, then do a second set if you've got it in you.
Be careful with 20/10
Ten seconds isn't long enough to recover, which is the whole point, but it's also not long enough to reset your posture. By round five most people are yanking with their arms and rounding at the catch. Only try this once Workouts 1 and 2 feel solid, cap your rate at 34, and stop the set the moment your lower back starts doing the work. If you have heart problems, high blood pressure or haven't exercised in a long time, speak to your GP before doing all-out efforts.
Twice a week suits most people, with at least one easy day between sessions. A third session can work if you're sleeping well and the rest of your training is light, but it's rarely where the progress comes from. Fill the other days with 20 to 30 minutes of steady rowing at 20 to 22 spm, walking or strength training. Hard days should feel hard; if every session feels medium, you're doing too many.
Rowing arms-first. When the pressure goes on, people start the drive by bending their elbows and hauling with their shoulders. Your legs should do most of the pushing, with your arms arriving last. Keep them straight until your legs are almost flat.
Cranking the resistance too high. Damper 10 or the top magnetic level feels like harder work, but it slows the stroke, shortens your intervals and loads your lower back. Set it once during the warm-up and leave it.
Stroke rate spiking with no power. Rating 36 with a split that's slower than it was at 28 is the classic HIIT failure. The fix is to slow your recovery and push harder with your legs; a quick drive and a slower slide forward, roughly 1:2, stays the rule even in sprints.
Skipping the warm-up. Your first two intervals will be slow and your technique will be scrappy, and the risk of tweaking something goes up. Eight minutes is a small price.
Going out too fast. Round one at a split you can't repeat turns the rest of the session into damage limitation. Start conservatively and finish strong.
Change one thing at a time. Add rounds first (8 to 10 of the 30/30s, 6 to 10 of the 250m repeats), then trim rest, and only then aim for a faster split at the same stroke rate. Once the short sessions feel manageable, give the longer pyramid more of your time, because longer intervals and more total work bring bigger fitness gains over a couple of months.
Two HIIT sessions a week, plus one or two easy steady rows of 20 to 30 minutes. Warm up before every session.
| Week | Session A | Session B |
|---|---|---|
| 1 | Workout 1: 30/30 x 8 | Workout 2: 1 on, 1 off x 6 |
| 2 | Workout 1: 30/30 x 10 | Workout 2: 1 on, 1 off x 8 |
| 3 | Workout 3: 250m x 6, 90s rest | Workout 4: 1-2-3-2-1 pyramid |
| 4 | Workout 3: 250m x 8, 90s rest | Workout 4: full pyramid |
After week four, swap one session for Workout 5 if your technique holds up, or repeat weeks three and four while chasing slightly faster splits. If you're still shopping for a machine to do all this on, our best rowing machines in the UK roundup covers which models have monitors worth pacing from.
It helps, mostly because it burns a lot of energy in a short session and uses your legs, back and arms together. A small 2022 study that combined 1-minute rowing and cycling intervals three times a week for 8 weeks recorded lower fat mass and higher lean mass in the men who took part. Your diet still decides most of the result, so treat rowing intervals as a strong supporting act rather than the whole plan.
Somewhere between 20 and 35 minutes including the warm-up and cool-down. The hard part itself usually lasts 4 to 16 minutes. If you can keep going for 45 minutes, the intervals weren't hard enough, and if your technique falls apart in the first round, they were too hard.
Most interval work sits between 24 and 32 strokes per minute. Longer efforts of 2 to 4 minutes suit 24 to 28, while short sprints of 30 seconds or less can go up to 30 to 34. Recovery should drop to an easy 18 to 20. If your rate climbs and your split gets slower, you're rushing the slide instead of pushing harder with your legs.
On an air rower, 3 to 6 covers almost everyone. Start at 4 and only go higher if the flywheel feels like it's running away from you on the drive. The number 10 doesn't mean a better workout; it makes each stroke slow and heavy, and your lower back usually pays for it. On a magnetic rower, pick a mid level that still lets you hold 26 strokes a minute with full leg drive.
Two sessions is the sweet spot for most people, three at most, with at least one easy day between them. Fill the rest of the week with steady rowing, walking or strength work. More interval days than that tends to make every session a bit worse rather than making you fitter.
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