The Claim
In trained individuals, resistance training with machine-based exercises results in greater strength gains compared to free-weight compound movements when volume and intensity are matched, with reported average 1RM increases of 50–63% for machine exercises versus 14–19% for free-weight lifts over a 9-week period, potentially due to greater familiarity with free-weight movements.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
If you're already fit, you might get stronger faster using gym machines like the chest press than doing classic lifts like squats or bench press — at least over 9 weeks — maybe because you're already used to the free weights.
See the scientific wording
In trained individuals, strength gains from resistance training are greater for machine-based exercises (e.g., hack squat, chest press) than free-weight compound movements (e.g., squat, bench press) when both are trained with equal volume and intensity, with average 1RM increases of 50–63% for machine exercises versus 14–19% for free-weight lifts over 9 weeks, likely due to greater familiarity with the latter.
When a person is used to doing a movement, their brain and nerves coordinate muscle contractions more precisely, allowing more muscle fibers to fire at once and produce more force.
What the research says
1 studyIn people who already work out, using machines like the chest press led to much bigger strength gains than doing classic lifts like bench press—even when they trained the same amount—likely because they were already used to the classic lifts.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.