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The fitness internet loves to trash gym machines. But the science doesn't agree — and neither does anyone who's actually used them properly.
If you spend any time in online fitness communities, you've heard it before. Free weights are king. Machines are for beginners. If you're not squatting, deadlifting, and pressing with a barbell, you're not really training.
It's one of those ideas that gets repeated so often it starts to sound like fact. But it isn't. It's a preference disguised as a principle — and it's causing a lot of people to leave gains on the table because they're too proud to sit down at a cable station.
Let's talk about what machines actually do, what the research says, and why the smartest lifters in any gym are using both.
Photo by Kaka Sandhu on Unsplash
Where the Anti-Machine Bias Comes From
The prejudice against machines has roots in the golden era of bodybuilding and the rise of powerlifting culture online. The argument goes something like this: barbells and dumbbells require stabilization, recruit more muscle fibers, and are more "functional" because they mimic real-world movement patterns. Machines, by contrast, lock you into a fixed path, do the stabilizing for you, and therefore produce inferior results.
There's a kernel of truth in there. Free weights do require more stabilizer engagement. A barbell squat demands more core activation than a leg press. A standing overhead press challenges your balance in a way a seated machine press doesn't.
But the leap from "free weights require more stabilization" to "machines are useless" is enormous — and the research doesn't support it.
What the Science Actually Says
A study by Schwanbeck et al. (2020) published in the Journal of Strength and Conditioning Research directly compared free weight and machine-based training programs over eight weeks. The result? Both groups saw similar improvements in muscle size and strength. The free weight group had slightly greater improvements in free weight-specific tests, and the machine group performed better on machine-specific tests — which makes sense given the principle of specificity. But in terms of raw hypertrophy, the differences were negligible.
This aligns with a broader body of evidence. A review by Gentil et al. (2017) in Sports Medicine examined multiple studies comparing free weights to machines for muscle activation and growth. Their conclusion was clear — when training volume and intensity are equated, machines produce comparable muscle hypertrophy to free weights. The mechanism of muscle growth doesn't care whether the resistance comes from a barbell, a cable, or a plate-loaded machine. What matters is that the muscle is exposed to sufficient mechanical tension and taken close to failure.
That last part is critical, and it's actually where machines have a distinct advantage in certain situations.
The Case for Machines: Isolation and Safety at Failure
One of the most important drivers of muscle growth is training proximity to failure — pushing a set to the point where you can barely complete another rep. Research by Schoenfeld et al. (2021) published in Sports Medicine found that training close to muscular failure is a key stimulus for hypertrophy, particularly for experienced lifters who need higher levels of effort to continue progressing.
Here's the problem with free weights and failure: they can be dangerous. Failing on a barbell bench press without a spotter can pin you under the bar. Failing on a heavy squat means dumping the bar or risking a collapse. Even with safeties and proper technique, there's an inherent risk that makes many lifters — consciously or not — stop a few reps short of true failure on compound free weight movements.
Machines eliminate that problem. You can push a leg press, a chest press, or a cable row to absolute failure without any safety concern. The weight stack catches. The fixed path supports you. You can chase that last rep without worrying about getting crushed. For hypertrophy-focused training, this is a meaningful advantage.
Machines Are Better for Targeting Weak Points
Another area where machines shine is isolation work. If your chest is lagging, a pec deck or cable fly allows you to target the pecs with minimal tricep or shoulder involvement. If your hamstrings need work, a lying leg curl isolates them in a way that no barbell movement can replicate. If your rear delts are underdeveloped, a reverse pec deck hits them directly.
Free weight compound movements are fantastic for building overall strength and size. Nobody is arguing against squats and deadlifts. But compound movements distribute load across multiple muscle groups — which means your weakest links often get underloaded while your dominant muscles compensate. Machines let you bypass that compensation pattern and load the specific muscle that needs attention.
This is why virtually every competitive bodybuilder — the people whose entire sport is maximizing muscle development — uses machines extensively. It's not because they don't know how to use a barbell. It's because they understand that machines serve a purpose that free weights can't fully replicate.
The Stabilizer Argument Is Overblown
The biggest criticism of machines is the stabilizer issue. "Machines don't train your stabilizers" is probably the most repeated line in any gym argument. And while it's technically true that a Smith machine squat requires less core stabilization than a free barbell squat, the practical significance of this is overstated for most people.
Research by Aerenhouts and D'Hondt (2020) published in the Journal of Sports Science and Medicine found that while free weight exercises do activate stabilizer muscles to a greater degree, the difference in overall training outcomes for general fitness and hypertrophy was minimal when programs were well-designed. Unless you're a competitive athlete who specifically needs stabilizer strength for sport performance, the stabilizer argument doesn't hold nearly as much weight as people think.
For the average person training to look better, feel stronger, and stay healthy, a program that combines compound free weight lifts with targeted machine work is going to produce better results than a program that dogmatically avoids machines.
How to Actually Use Machines in Your Program
The smart approach isn't machines or free weights. It's both — used strategically.
Start your sessions with compound free weight movements when you're fresh. Squats, bench press, deadlifts, overhead press, rows. These lifts deliver the most bang for your buck in terms of overall strength and muscle recruitment, and they benefit from being performed early when your energy and focus are highest.
Then transition to machines for your accessory and isolation work. This is where you target specific muscles, push closer to failure safely, and accumulate additional volume without the fatigue and injury risk that comes from grinding out more free weight sets when you're already tired.
A practical example: on a push day, you might start with barbell bench press for 4 sets, move to an incline dumbbell press for 3 sets, and then finish with cable flyes and a machine lateral raise for 3 sets each. The barbell and dumbbell work builds your foundation. The machine and cable work fine-tunes the details.
If you're doing a lot of cable work and machine pulling movements — lat pulldowns, cable rows, face pulls — a solid pair of lifting straps makes a noticeable difference. Your grip will often fail before your back does on these exercises, which limits how much tension you can actually put on the target muscle. Straps take your grip out of the equation and let you focus entirely on the pull. I resisted using them for years because of the "grip strength" argument, but once I tried them for heavy cable rows, I immediately felt a difference in how much I could load my lats.
Stop Listening to the Internet Purists
The free weight purist position is built on identity more than evidence. It feels hardcore to say you only use barbells and dumbbells. It sounds disciplined. It looks good in a social media caption. But it's not optimal — and anyone telling you that machines are a waste of time either hasn't read the research or is more interested in their image than their results.
The best lifters in the world — from powerlifters to bodybuilders to strength coaches — use machines as part of their training. Not because they're lazy. Because machines do things that free weights can't, and combining both produces better outcomes than using either alone.
Use the tools available to you. All of them. That's not a compromise. That's smart training.
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Sources:
- Schwanbeck, S.R. et al. (2020). Effects of training with free weights versus machines on muscle mass, strength, free testosterone, and free cortisol levels. Journal of Strength and Conditioning Research.
- Gentil, P. et al. (2017). A review of the acute effects and long-term adaptations of single- and multi-joint exercises during resistance training. Sports Medicine.
- Schoenfeld, B.J. et al. (2021). Resistance training recommendations to maximize muscle hypertrophy in an athletic population: Position stand of the IUSCA. International Journal of Strength and Conditioning.
- Aerenhouts, D. & D'Hondt, E. (2020). Using machines or free weights for resistance training in novice males? A randomized parallel trial. Journal of Sports Science and Medicine.
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