Some people’s muscles grow a lot with training, others don’t—but if one person’s arms grow, their legs usually grow similarly, meaning your body’s natural response is more important than which muscle you train.

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Evidence from Studies

Supporting (1)

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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 trained their arms and legs with different weights, each person’s muscles grew about the same amount in both areas—suggesting that your body’s natural biology, not the workout details, is what mostly determines how much you grow.

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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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