v1

correlational

Analysis v1

Strong Support

If you're new to lifting weights, how muscular you already are doesn't really predict how much you'll grow from training — it's not a strong clue.

56

Pro

0

Against

Evidence from Studies

Supporting (2)

56

Community contributions welcome

51

Muscle Transcriptional Networks Linked to Resistance Exercise Training Hypertrophic Response Heterogeneity.

Cohort Study

Human

2021 May 1

The study looked at how people's muscles respond to weight training and found that what their bodies are like before starting doesn't strongly predict how much they'll gain, which supports the idea that starting muscle size isn't a great predictor of growth.

42

Resistance training-induced appendicular lean tissue mass changes are largely unrelated to pre-training bone characteristics in a larger cohort of untrained adults

Cohort Study

Human

2025

The study looked at how much muscle people gained from weight training and whether starting with more muscle helped predict gains. It found that how much muscle you start with doesn’t really predict how much you’ll gain.

Contradicting (0)

0

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Similar Assertions

Individual hypertrophic responses to resistance training are highly variable across muscle groups and are not consistently correlated between upper and lower body musculature.

62

0

81%

If you're new to lifting weights, things like how much you eat, how much protein you get, how old you are, or your BMI don’t really help predict how much muscle you’ll gain in the first few months.

42

0

80%

Individual hypertrophic responsiveness to resistance training exhibits moderate inter-muscle correlation, but a substantial proportion of variability is attributable to non-exercise-specific biological factors.

59

32

80%

If you're a guy between 18 and 40 and you start lifting weights, whether you're new to it or have been doing it for years, you probably won't gain much more muscle just because you're experienced—but the people who’ve trained the longest (4+ years) still tend to gain the most muscle, so experience doesn’t always make a clear difference.

0

80%

If healthy guys between 18 and 40 lift weights regularly for at least two weeks up to a year, they typically gain about 1.5 kilograms of muscle—no matter what kind of weight routine they follow.

58

0

79%