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Rated intermediate, the Cable Single Arm Reverse Fly develops the shoulders through a pull pattern loaded by cable machine. The muscular job here is to raise and rotate the upper arm, and that translates directly into overhead capability and shoulder joint stability. What separates this variation from other shoulders work is that it is training one arm at a time and emphasising a reversed movement direction — a detail that changes which fibres take the load and how much stability the movement demands. Note the 'Single Arm Reverse Fly' component of the name: it specifies how this variation differs from otherwise similar shoulders movements. Support comes from the traps and rotator cuff; the traps in particular help elevate and retract the shoulder blades, which is why fatigue there often shows up before the shoulders is fully worked. Training this with cable machine keeps constant tension on the muscle through the entire range, though it requires an available station and correct pulley height. Programme it alongside your other shoulders work rather than as a standalone. It assumes you already own the basic pattern and can maintain position under moderate load.
The Cable Single Arm Reverse Fly is primarily a shoulders exercise, but it is never only the shoulders doing the work.
The general rule for the Cable Single Arm Reverse Fly is simple: inhale on the lowering phase, exhale as you pull. For heavier sets, take a breath in at the start position, brace as though bracing for a punch, and hold that pressure through the hardest part of the rep before exhaling. Consistent breathing is what keeps your brace intact from the first rep to the last.
Reduce the load and perform the Cable Single Arm Reverse Fly for higher repetitions, focusing entirely on position rather than weight. If cable machine feels unmanageable, rehearse the same pattern with bodyweight first. Stay at this level until every Cable Single Arm Reverse Fly rep looks the same as the first.
Increase total working sets before increasing load — volume drives most of the adaptation at this stage. Track your Cable Single Arm Reverse Fly numbers so you can see whether the shoulders is actually progressing.
Slow the lowering phase to three or four seconds to accumulate tension without adding weight. Use the Cable Single Arm Reverse Fly as your accessory once your main shoulders lift is done for the day.
The Cable Single Arm Reverse Fly suits most healthy trainees, but it is not appropriate for everyone.
This is general educational information, not medical advice. If you are managing an injury or medical condition, check with a qualified professional before adding this exercise to your programme.
It primarily trains the shoulders, with the traps and rotator cuff assisting. The pattern is classified as pull, so the lats, mid-back, rear delts and biceps share the workload.
It is rated intermediate. You should already be comfortable with basic shoulders work and able to hold position under moderate load before attempting it.
A practical starting point is 4 sets of 8-12, resting 60-90 sec between sets, roughly 2x per week. Adjust from there based on how you recover.
You need cable machine. This keeps constant tension on the muscle through the entire range, though it requires an available station and correct pulley height.
As a general rule, inhale on the lowering phase, exhale as you pull. Avoid holding your breath for the entire set.
Using momentum from the lower back to swing the weight. The simplest correction is to lead with the elbow rather than the hand so the back does the work instead of the arms.
Good substitutes that train the same shoulders pattern include Barbell Behind The Back Push Press Single Arm Balance, Dumbbell Around The World, and Barbell Back Wide Shrug. Pick whichever matches the equipment you have available.
Yes. Start each set with your weaker side and match the stronger side to whatever it managed — that is how you close an imbalance rather than reinforce it.
Where the Cable Single Arm Reverse Fly earns its place is repeatability — cable machine makes the setup easy to reproduce, which is what lets you actually progress the shoulders.
The shoulders, or deltoids, cap the upper arm and are made up of three distinct heads: the anterior (front) deltoid, the lateral (side) deltoid, and the posterior (rear) deltoid. Each head pulls the arm in a different direction, so building round, capped, three-dimensional shoulders requires training all three rather than relying on pressing alone. Well-developed shoulders create the width that makes the waist look smaller and the upper body look athletic.
Overhead pressing — with a barbell, dumbbells, or in the Arnold press variation — is the primary mass builder, heavily recruiting the front delts along with the triceps and upper chest. However, the front delts also receive a great deal of work from all chest pressing, so most lifters already have well-developed fronts and underdeveloped sides and rears. That imbalance is why lateral raises, which isolate the side delt and directly widen the shoulders, are one of the most valuable exercises in any physique routine. Rear-delt work such as face pulls and reverse flyes corrects posture and completes the rounded look.
The deltoids are made up of fibres that respond well to higher volume and frequency. Pressing can be trained in moderate ranges around 6 to 10 reps, while lateral and rear-delt isolation thrives in higher ranges of 12 to 20 with controlled tempo, since these movements are about tension and consistency rather than heavy load. Training shoulders two or three times per week, with an emphasis on the side and rear heads, produces the most balanced development.
The shoulder is the most mobile and least stable joint in the body, which makes technique and warm-up especially important. Avoid pressing behind the neck, control the weight on raises rather than swinging it up with momentum, and do not chase heavy dumbbells on lateral raises at the expense of form — leading with the elbows and stopping at shoulder height keeps tension on the delt and the strain off the joint. Including rear-delt and rotator-cuff work helps keep the shoulder healthy for years of training.
Strong, balanced shoulders improve your pressing strength, protect against common gym injuries, and dramatically improve the look of the upper body. Prioritise all three heads using the popular shoulder exercises below.