People grow muscle at very different rates — but each person tends to grow their arms and legs similarly, no matter what weight they use. This means your genes and biology matter more than how heavy your weights are.

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Pro

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Against

Evidence from Studies

Supporting (1)

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Community contributions welcome

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Resistance training load does not determine resistance training-induced hypertrophy across upper and lower limbs in healthy young males.

Randomized Controlled Trial

Human

2025 Dec 31

Even when people lifted heavy or light weights, their muscles grew similarly within their own body—some people’s muscles grew a lot, others hardly at all, but each person’s pattern stayed the same across arms and legs, suggesting your genes and biology matter more than how heavy the weights are.

Contradicting (0)

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No contradicting evidence found

Source Study

Resistance training load does not determine resistance training-induced hypertrophy across upper and lower limbs in healthy young males.

Score: 46

DOI: 10.1113/JP289684

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