Cables vs free weights: what the cable really changes | Overload

The cable keeps the tension on from the start of the movement to the end. Does that build muscle faster?

Cable hammer curl, triceps pushdown, cable reverse fly: for each one, someone asks whether the cable or the free-weight version is better, and what the cable changes in practice.

There are two answers, and they point in different directions. Mechanically, the cable changes something. For muscle growth measured in a laboratory, it changes almost nothing. And the cable station has a limit that has nothing to do with either: the muscles it cannot train.

What the cable changes mechanically

With a dumbbell, the resistance comes from gravity, so it is always vertical. The muscle therefore works hardest when the limb is horizontal, and almost not at all when it is vertical. That is why a dumbbell curl gets easy at the top of the movement.

With a cable, the resistance follows the direction of the cable. You choose that direction by changing the pulley height or by moving relative to the machine. The tension is therefore present across the whole range, including where the dumbbell asks for nothing.

In practice, the resistance profile becomes adjustable and the muscle works over a wider slice of the movement. That is the cable's one mechanical advantage, and it is well documented.

On hypertrophy, the gap is zero

Three studies have directly compared the two modalities on identical exercises.

Nunes et al. (2020) had 35 people do a preacher curl for 10 weeks, on the cable for one group and with a barbell for the other, 3 times a week. Biceps thickness increased by +7% on the cable and +8% with the barbell, with no significant difference between the two (p = 0.346). Force torque at 20 degrees of flexion, on the other hand, improved more with the barbell (+39% against +30%, p = 0.046).

Larsen et al. (2025) tested the lateral raise on 24 trained lifters for 8 weeks, with one arm on the cable and the other on a dumbbell within the same person. Lateral deltoid thickness improved by 3.3 to 4.6% with no gap between the two sides. The authors conclude that there is statistical support for equivalence, even though the two versions have opposite resistance profiles.

Haugen et al. (2023) pooled 13 studies and 1,016 participants comparing machine-based and free-weight loads. On hypertrophy the difference is zero (SMD = -0.055). On strength it exists, but it is specific to the test format: you improve more on the test that resembles the training you did.

What this means

For muscle growth, choosing the cable or the dumbbell on a given exercise does not change the outcome. For strength measured on the barbell, barbell training keeps an advantage. The specificity is about the test, not about muscle growth.

The 74 cable exercises in the Overload reference library

What limits the cable is muscle coverage. The Overload exercise reference library contains 891 movements. The match keeps an exercise as soon as the pulley or the cable appears in its French name, its aliases, or its English name in the app library: 74 exercises meet that criterion, which is 8.3% of the library. The table breaks them down by muscle group, with the number of uses members recorded on each group.

One note on the method, because it changes how you read the table: the match runs on the name (French and English) and the aliases. An exercise that is performed on a cable but whose fields never say so slips through, and there are some (the pull-through, for instance, is very much a cable movement). 74 is therefore a floor, not a complete inventory, and a cell at 0 reads as "none found by this method", never as "none exists". What carries the information is the orders of magnitude and the gap between the upper body and the lower body, not the exact row-by-row count.

Muscle group	Cable exercises found	Total in library	Share	Member uses
Shoulders	14	130	11%	1,449
Triceps	12	72	17%	2,143
Abdominals	10	96	10%	365
Biceps	10	54	19%	1,220
Chest	10	87	11%	840
Lats	8	43	19%	644
Middle back	2	34	6%	1,501
Quadriceps	2	150	1%	100
Forearms	2	25	8%	172
Glutes	2	25	8%	131
Traps	2	15	13%	22
Lower back	0	27	0%	0
Hamstrings	0	79	0%	0
Calves	0	28	0%	0
Adductors	0	13	0%	0
Abductors	0	8	0%	0
Neck	0	8	0%	0

The five cable exercises members use most

The usage ranking, built with the same matching method (French name, English name or aliases), points the same way. Each name links to its page in the library, with the muscles it works and its variants.

All upper body, and four isolation movements out of five.

The distribution leans heavily to one side. Of the 74 exercises found, only a small handful target the legs or the posterior chain, and everything else works the upper body and the trunk. Against the 330 exercises in the library whose primary muscle is lower-body, cable coverage there is on the order of a few percent, compared with 11 to 19% on the shoulders, triceps, biceps and lats.

On several lower-body groups, the name search returns no cable exercise at all. Given the method limit described above, take those empty cells for what they are: the sign of a very thin offering in that area, not proof that nothing exists. The gap between the upper body and the lower body is far too wide to come from a counting error, and that gap is what counts here.

The library is not the cause. A cable station pulls along a single fixed line, which suits isolating one segment and does not suit loading the trunk and legs axially with heavy weight.

The cable is the right choice

On upper-body isolation, when you want tension in the shortened position (lateral raises, reverse flyes, triceps extensions), on unilateral movements, and when a joint reacts badly to the jolt of picking up a dumbbell.

Free weights stay necessary

On the whole lower body and the posterior chain, on heavy multi-joint movements, and if your goal is strength measured on the barbell. No cable station replaces a squat or a deadlift.

Practical recommendations

Choose the cable or the dumbbell based on joint comfort and equipment availability, not in the hope of more muscle growth. The three studies converge on the absence of any gap.
Set the pulley height according to where you want the tension. That is the only setting that changes the resistance profile.
If you are preparing for a barbell strength test, train with the barbell. The advantage Haugen et al. found is about the test format.
Do not build a leg session around the cable station. The offering there is marginal compared with the upper body, and you will spend more time hunting for variations than training anything.
Check your muscle coverage across several weeks rather than session by session. A gym where you chain cable stations together produces an upper/lower imbalance very quickly.

Tracking muscle balance

Overload is a structured strength training app. Its "Muscle balance" section shows, on a single body outline, the muscles you have worked over the last 7, 30 or 90 days, with the number of sessions counted over the period. That is the view that makes the imbalance described above visible, when the sessions pile up at the cable stations. Get Overload, log a few weeks of sessions, and see which half of the outline stays blank.

Conclusion

The cable delivers on its mechanical promise: the tension stays where the dumbbell loses it. But that difference does not translate into extra muscle, and it comes with coverage that stops at the upper body. Use the cable for what it does well, comfortable and adjustable isolation, and keep free weights for everything else.

References

This article presents the current scientific data. For a personalized program, consult a healthcare professional.