The Claim

In trained individuals, familiarity with an exercise has a weaker influence on strength improvement compared to its biomechanical complexity, such that less complex machine exercises that are less familiar lead to greater 1RM strength gains than more complex, more familiar free-weight lifts when training volume and intensity are matched.

Source: Equal-Volume Strength Training With Different Training Frequencies Induces Similar Muscle Hypertrophy and Strength Improvement in Trained Participants

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
68score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Cause and effect
1 study reviewed
In plain English

If you're already fit, you might get stronger faster on machines you're not used to, even if they're simpler, compared to the free-weight exercises you've done a lot before — as long as you're doing the same amount and intensity of training.

See the scientific wording

Familiarity with an exercise is a stronger determinant of strength improvement than its biomechanical complexity (e.g., degrees of freedom) in trained individuals, as evidenced by greater 1RM gains in less complex, less familiar machine exercises compared to more complex, more familiar free-weight lifts trained under identical volume and intensity conditions.

Why this might work

When a person does an exercise they haven't done before, their brain and nerves learn to activate the right muscles more efficiently and with less wasted effort, which lets them lift heavier weights faster, even if the exercise is simpler.

Supported mechanismbased on 1 study

What the research says

1 study

  1. Study: Equal-Volume Strength Training With Different Training Frequencies Induces Similar Muscle Hypertrophy and Strength Improvement in Trained Participants

    Even though the machines were simpler, people got stronger faster on them because they weren’t used to them—while they didn’t improve as much on the free-weight exercises they’d done for years, even though they trained the same amount. This suggests being new to an exercise matters more than how complicated it is.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.