Single-Arm Dumbbell Row
lats
What moves the load, and what it costs
6.0MET
Lats is the prime mover, with the upper back, biceps, rear deltoid assisting. The most widely used back exercise in any gym, for good reason: supported spine, long range, one side at a time, and almost impossible to get badly wrong.
Cue: Brace one hand and one knee on a bench, and pull the dumbbell to the hip with the shoulder blade moving first.
Written on other cards as: One-arm dumbbell row · Kroc row
SOURCE·2024 Adult Compendium of Physical Activities·FILED UNDER WEIGHTS, VIGOROUS·REVIEWED JUL 2026
SHARED AXIS · SEVEN VALUES FROM ONE TABLE · HIGHLIGHTED ROW IS THIS MOVEMENT
The compendium files single-arm dumbbell row under a category, not a lift. Read the ladder as position, not precision: this is heavier work than sitting quietly by a factor of 6.0, and at the top end of what a gym floor produces.
Turning that MET value into a real energy cost
- Map the movement to a published category. The compendium measures categories of conditioning work, never individual lifts, so single-arm dumbbell row is filed under Resistance training (weight lifting, free weight or machine), power lifting or body building, vigorous effort.
- Take the category's MET value — 6.0. One MET is the cost of sitting quietly, so this is 6.0 times resting metabolism.
- Multiply by 3.5 to get millilitres of oxygen per kilogram per minute, the unit the MET is actually defined in.
- Multiply by your bodyweight in kilograms and divide by 200. The result is kilocalories per minute of work.
- Count working minutes only. Under load, not under the roof — a set of eight is about 25 seconds of the hour you were there.
kcal/min = MET × 3.5 × body mass (kg) ÷ 200 Single-Arm Dumbbell Row: 6.0 × 3.5 × 70 ÷ 200 = 7.35 kcal/min
SOURCE·ACSM metabolic equation + 2024 Adult Compendium of Physical Activities·REFERENCE BODY MASS 70 KG·REVIEWED JUL 2026
What is actually doing the work
| Muscle | Role | What it does here |
|---|---|---|
| LatsLatissimus dorsi | Prime mover | Pulls the upper arm down and back towards the ribs (shoulder extension and adduction) and rotates it inwards. It is the prime mover in every pull-up and pulldown. |
| Upper backRhomboids and middle trapezius | Synergist / stabiliser | Draws the shoulder blades together and towards the spine (scapular retraction). Every horizontal row loads it; every pulldown loads it less. |
| BicepsBiceps brachii and brachialis | Synergist / stabiliser | Bends the elbow, and (biceps brachii only) turns the palm upwards. It also crosses the shoulder, which is why the incline curl feels different from the preacher curl. |
| Rear deltoidPosterior deltoid | Synergist / stabiliser | Draws the upper arm backwards and out (shoulder horizontal abduction and extension). Works with the rhomboids and mid traps on every wide-elbow row. |
The prime mover produces the movement against the resistance; synergists assist and stabilisers hold a joint still without moving it. An exercise trains the whole muscle it loads — there is no way to work only part of a muscle, and no exercise removes fat from the area around it.
Set up, then earn the rep
Dumbbells, Bench. Every rep should look like the first one. The moment it stops looking like the first one, the set is finished.
PATTERN · PULL
- Set your chest against the pad so the torso cannot move and the back has to do the work.
- Let the dumbbells hang at arm's length with the shoulder blades allowed to spread forward.
- Brace one hand and one knee on a bench, and pull the dumbbell to the hip with the shoulder blade moving first.
- Start the pull by drawing the shoulder blades back, then pull the elbows past your ribs.
- Touch or come close to the torso, hold for a beat, then lower all the way to a full stretch.
- Keep the neck in line with the spine and the torso angle unchanged for the whole set.
Where this one breaks down
Not theory. These are the faults you correct on a gym floor, and the correction that actually works.
Standing up a little on every rep.
Using the hips to help means the back gets less, not more. Fix the torso angle and lower the weight.
Rounding the lower back.
In a bent-over position that is the one thing worth being strict about. Set the spine before the first rep and stop the set when you cannot hold it.
Pulling with the arms only.
The shoulder blades move first. If they never retract, the exercise is a curl with extra steps.
Shortening the bottom of the range.
Let the weight down until the lats are fully stretched — that range is where the growth is.
Regress it, or progress it
Regress — earn it first
Prescription: load, reps, rest
Read off the goal, then hold the technique constant as the load climbs. Derived from the movement's mechanics, not invented for this page: a compound lift loads several joints, so it tolerates heavy loads and needs long rests.
| Goal | Sets | Reps | Rest | Notes |
|---|---|---|---|---|
| Strength | 3–5 | 3–6 | 3–5 min | Heavy loads need long rests. Cutting rest to two minutes turns a strength set into a conditioning set. |
| Muscle size | 3–4 | 6–12 | 90–180 sec | Take most sets to within one to three reps of failure. Total weekly hard sets per muscle matters more than the exact rep number. |
| Endurance / fat loss | 2–4 | 12–20 | 45–75 sec | Lighter loads and shorter rests. Fat loss is decided by the diet; this preserves muscle while it happens. |
| First month | 2–3 | 8–10 | 2 min | Well short of failure, same weight every set, until the movement looks the same on the last rep as the first. |
Time under load, in kilocalories
Read these as minutes of work, not minutes in the building. A set of eight takes about twenty-five seconds; the rest of the hour is rest, chalk and queueing.
Mapped category: Resistance training (weight lifting, free weight or machine), power lifting or body building, vigorous effort — 6.0 MET. That is the published category this movement is filed under, not a measurement of this specific lift.
Worked at 6.0 MET × 3.5 × 70 kg ÷ 200 = 7.35 kcal per working minute for a 70 kg adult. Scale it by your own bodyweight; the equation is linear. The full activity dataset lives at BurnLab.
SOURCE·2024 Adult Compendium of Physical Activities·CATEGORY VALUE, NOT A PER-EXERCISE MEASUREMENT·REVIEWED JUL 2026
If the rack is taken
Substitutes train the same prime mover through the same pattern with different kit. Computed from the muscle and pattern data on this card, not hand-picked to fill a grid.
Where it sits in a week
One movement is not a programme. The twelve templates put these in order, including 6 that need no gym at all.
The questions that come up on the floor
What muscles does the single-arm dumbbell row work?
Single-Arm Dumbbell Row is a compound movement in which the lats is the prime mover, assisted by the upper back, biceps, rear deltoid. Pulls the upper arm down and back towards the ribs (shoulder extension and adduction) and rotates it inwards. It is the prime mover in every pull-up and pulldown.
Is the single-arm dumbbell row good for beginners?
Yes. It rates 2 out of 5 for technical difficulty on this site — learnable in a session or two; low injury cost if it goes wrong. Start with the lightest sensible load and two or three sets of 8–10.
What can I do instead of the single-arm dumbbell row at home?
This movement is difficult to reproduce without equipment. Where a bodyweight substitute does not exist, progress by slowing the tempo and using single-limb versions instead of adding load.
How many sets and reps of the single-arm dumbbell row should I do?
For muscle size, 3–4 sets of 6–12 with 90–180 sec rest. For strength, 3–5 sets of 3–6 with 3–5 min rest. In your first month, 2–3 sets of 8–10, stopping well short of failure. Total weekly hard sets per muscle group matters more than the exact rep number in any of these ranges.
Does the single-arm dumbbell row burn fat from the lats?
No. No exercise removes fat from the area it trains — spot reduction has been tested repeatedly and does not happen. Training the lats builds the muscle underneath; where body fat is lost from is decided by an overall calorie deficit and by your genetics, not by which exercise you chose.
Muscle roles follow standard kinesiology references and are described by joint action rather than by gym convention — see how this site is built. Energy figures are derived from the 2024 Adult Compendium of Physical Activities. Every reference is named and dated on the sources page. General information only — not medical or coaching advice. Load, form and progression should be adjusted to your own experience and any injury history. When in doubt, get coached in person.
SOURCE·Published exercise references·MUSCLE ROLES ASSIGNED BY JOINT ACTION·REVIEWED JUL 2026
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