Cable External Rotation
rotator cuff
What moves the load, and what it costs
3.5MET
Rotator cuff is the prime mover, with the rear deltoid assisting. Direct work for the muscles that keep the shoulder centred in its socket. Very light, high reps, twice a week — it is insurance, not training.
Cue: Keep the elbow pinned to your side at 90 degrees and rotate the forearm outward away from the body.
SOURCE·2024 Adult Compendium of Physical Activities·FILED UNDER WEIGHTS, 8–15 REPS·REVIEWED JUL 2026
SHARED AXIS · SEVEN VALUES FROM ONE TABLE · HIGHLIGHTED ROW IS THIS MOVEMENT
The compendium files cable external rotation under a category, not a lift. Read the ladder as position, not precision: this is heavier work than sitting quietly by a factor of 3.5, and middling for conditioning work.
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 cable external rotation is filed under Resistance training (weight lifting), multiple exercises, 8–15 repetitions at varied resistance.
- Take the category's MET value — 3.5. One MET is the cost of sitting quietly, so this is 3.5 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 Cable External Rotation: 3.5 × 3.5 × 70 ÷ 200 = 4.29 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 |
|---|---|---|
| Rotator cuffSupraspinatus, infraspinatus, teres minor, subscapularis | Prime mover | Rotates the upper arm and, more importantly, holds the ball of the shoulder centred in the socket while bigger muscles move it. |
| 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
Cable machine. Every rep should look like the first one. The moment it stops looking like the first one, the set is finished.
PATTERN · PULL
- Set a cable at elbow height and stand side-on with the working arm furthest from the machine.
- Tuck a rolled towel between the elbow and your ribs to keep the upper arm in place.
- Keep the elbow pinned to your side at 90 degrees and rotate the forearm outward away from the body.
- Take the handle across your body with the elbow bent to 90 degrees.
- Rotate the forearm outward as far as it comfortably goes, keeping the elbow glued to your side.
- Return slowly. Two to three seconds each way, fifteen to twenty reps.
Where this one breaks down
Not theory. These are the faults you correct on a gym floor, and the correction that actually works.
Elbows dropping below the hands.
Then it is a row. The upper arms should finish parallel to the floor for the rear delt and external rotators to do the work.
Too much weight.
Face pulls are a high-rep, light, shoulder-health movement. If the trunk is swinging, the point has been lost.
Rushing them.
Two seconds out, two seconds back. This is the one exercise where being boring is the entire benefit.
Regress it, or progress it
Regress — earn it first
Nothing on this site regresses it further: this is already near the entry point of its pattern. Take load off, shorten the range, or slow the tempo — in that order.
Progress — the next demand
This sits at the top of its progression here. Add load, add range, slow the tempo or go single-limb before you go looking for a new exercise.
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 single-joint movement does its best work in moderate to high reps — very low reps load the joint before the muscle.
| Goal | Sets | Reps | Rest | Notes |
|---|---|---|---|---|
| Strength | 3–4 | 6–10 | 2 min | Single-joint work responds poorly to very low reps — the joint gets the load before the muscle does. |
| Muscle size | 3–4 | 10–15 | 60–90 sec | This is where isolation work earns its place: cheap volume for one muscle, little systemic fatigue. |
| Endurance / fat loss | 2–3 | 15–25 | 30–45 sec | High reps here are genuinely useful — the load is small enough that form survives the fatigue. |
| First month | 2 | 12–15 | 60 sec | Light. Isolation work is for adding volume later, not for building a base. |
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), multiple exercises, 8–15 repetitions at varied resistance — 3.5 MET. That is the published category this movement is filed under, not a measurement of this specific lift.
Worked at 3.5 MET × 3.5 × 70 kg ÷ 200 = 4.29 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 cable external rotation work?
Cable External Rotation is a single-joint isolation movement in which the rotator cuff is the prime mover, assisted by the rear deltoid. Rotates the upper arm and, more importantly, holds the ball of the shoulder centred in the socket while bigger muscles move it.
Is the cable external rotation good for beginners?
Yes. It rates 1 out of 5 for technical difficulty on this site — learnable in a single session with no coaching. Start with the lightest sensible load and two or three sets of 12–15.
What can I do instead of the cable external rotation at home?
The band external rotation is the nearest home-friendly version. 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 cable external rotation should I do?
For muscle size, 3–4 sets of 10–15 with 60–90 sec rest. For strength, 3–4 sets of 6–10 with 2 min rest. In your first month, 2 sets of 12–15, 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 cable external rotation burn fat from the rotator cuff?
No. No exercise removes fat from the area it trains — spot reduction has been tested repeatedly and does not happen. Training the rotator cuff 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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